Im really sorry your experiencing this. Personally i don't think anybody on here is going to be able to give you any proper insight into what is going on - they might be able to lessen your anxiety by revealing that they themselves have been in a similar situation but i think really your just gunna have to bite the bullet and go to the doctor to find out whats wrong - it might be something psychological or physical and no doubt you've probably done plenty of your own research but why not finally put your mind at rest and get a professional opinion? Perhaps you could specify what doctor you want to see or go to a specialist clinic if there are any near where you live? I have nothing else to offer really in the way of advice but we're all here to support you if you need it. There is a physical sickness/injury forum on here so maybe you might want to try posting on there as well? good luck.