I'm not in this group but had to come over to reply, I know you from another group and all. I have been there on the terrified, fought my way out. It is insane to feel this way. All I can say is to ignore ignore and try to maintain some sort of semblance of sanity it seems to help the inner insanity and it's a fake it until you can make it thing. Helped me immensely.
Don't act on what you think, those are fleeting and yeah maybe common thoughts but actions can be permanent.
Calming yourself may be freaking impossible sometimes but do what ya got to do, anything that will take you down a level to sane. Familiar safe- comforting...any you got? Stay with those.
xx

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If your ill in your stomach it's either an acute problem or mental irritance assumptively I say because your subject reference I understand to be vague. The even possible solution instigating a mind to signal fear meaning you could do well from more or within better balance. If that doesn't ring a bell, maybe your immune system is trying to persuade you to be in a more strenuous active state with particularly good air. For instance a room with a humidifier or an open window to breath different air, either sleeping more in a (I think it is called REM cycle) deep mindstate or simply working out more. Our minds do have the power to convince us wrong is occuring when in reality the situation couldn't possibly be any more truthful within reality.

I hope you find your solution.

If you are having physical problems, it might be the result of a psychosomatic illness, meaning your mind is experiencing so much pain that it's causing your body to become ill as well. If so, you should look into medication that would counter the effects of the physical symptoms that you are experiencing.