Hello Sister. May I share with you in reverse order to your post.
I know from personal experience as we all do, what suffering and grief can bring. All I can say sister is that in the light of knowing God’ love directly all that grief become the proof of God’ love for us and His goodness in it.
Your daughters inclination to be drawn by the world isn’t so unusual as it seems, if there is a desire to be right with God and to please Him even childishly, God will keep her. In the end she will comprehend what is necessary to turn away from such inclinations and learn how to trust God in all things.
I think your thoughts about visualisation are spot on. The more ability a person has to visualisation of things, the more at risk they are to the air. The mechanism by which we can visualise is God given, but the power by which we visualise must also be God given in disregard of ones own power of the soul. So that we know that God gives visions of the mind which inspire and encourage the one who receives them. It can be reviving grace to the one who desires to know sound and reasonable things, and who meditates upon the Lord. There is also visions and revelations which are not of the natural mind. Yet such visions and revelations, being of the spirit, and which correspond to the mind of Christ in us, are not of the soul and cannot draw on the souls power to present them. These require no effort and come in an instant and pass away in an instant also. They leave the natural mind with understanding and contribute to the renewing of the natural mind. In any event no believer should use their natural mind to visualise the things of God. Neither is it wise to train the mind to visualise, for the very reason you yourself have stated. It attends to psychological theories which are in many instances informed by demonic ambition and knowledge and which are a gate and a way of being led of the prince of the power of the air.
As to your daughters own awareness of the physical symptoms of VCD there is one psychological theory which is not demonic of itself and which a rational understanding of yourself may help you to teach your daughter to break that cycle of response which is presently makes certain the outcome. This theory is called classical conditioning theory. Operant Conditioning Theory, is closely linked where learned behaviour may also become relevant. Stick with the classical model initially, which is a purposeful physical model of understanding reasonable physical response to a physical stimulus. The stimulus is the VCD episode and the response is sympathetic. The outcome is physical deterioration of the breathing cycle which, via the Vagus Nerve, leads to other physical symptoms associated with hyperventilation. The Vagus nerve is the brain stem nerve which links parts of the body, including the larynx as well as the diaphragm as well as the upper colon (amongst other part of the body). The fear which is produced during an episode of VCD is nothing more than an awareness of this nervous response to hyperventilation. Over time this cycle of stimulus and response can lead to behavioural (Operant) conditioning, yet this is nothing more than the person believing they have a reason to be afraid because their stomach and upper colon are responding nervously which then leads to huge releases of adrenaline which itself intensifies the sensation and further informs the mind, which further produces panic. The necessity and importance of dealing with the causality of VCD itself becomes clear therefore. How to deal with that may be many things. Including a diagnosis of the underlying pathology of the cause of the reflux and not simply a symptomatic disorder diagnosis such a VCD. There are several basic ways to deal with the problem of reflux. Neutralise the acid, suppress acid production or else control the upper oesophageal sphincter through a medicine such as Venlafaxine Hydrochloride Extended Release. (Effexor XL). This link will give you the chemical formulae and structure.
http://www.usp.org/sites/default/files/usp_pdf/EN/USPNF/revisions/m88082-venlafaxine_hydrochloride_extended-release_capsules.pdf
I recall you sharing that you had some science training and I realise that you prefer natural remedies. However, if after some time you cant deal with the underlying physical stimulus which triggers VCD episodes your daughter may “learn” how to induce non justified attacks which are entirely psychosomatic and have no basis in physical reality. The point about the Effexor XL is that it is a slow release system, and would probably require just 1 No/ 15 mg capsule once a week for 3 months to control the upper oesophageal sphincter long enough to help your daughter to think ahead of her present reality as well as to find a non chemically formulated way of controlling acid production.
Clearly Sister this is not medical advice. I am not qualified to give such advice whatsoever. It is personal knowledge and nothing more. Your daughters doctor would no doubt have a view of this information if you were to ask him/her.
For a good natural approach see this link
http://www.acidrefluxremediesforall.com
I will pray for your daughter as well trusting that the Lord Himself can help her to overcome.