My experience is similar to Loial .. debilitating health anxiety (mainly Cancer phobia).. feel like I'm hurtling through space with nothing to grab on to, cold feeling all over, butterflies so severe in my stomach, can't think clearly, can't eat (lost 10kg in a couple of weeks), severe IBS-d, can't sleep, either pace the house or sit rigid in a chair .. got so bad last year, was hospitalised for a week. Now taking Nortriptyline and Risperidone. Anxiety has improved somewhat, but still lurking in the background. Also have trouble talking to people and being in crowds (have absurd thought of to many germs and can't stand the noise!). Panic attacks are under control to a degree. Haven't had a bad one since early last year. Just 'keeping it together' these days.