because you are seeing a psychologist doesn't make you insane... They help with issues regarding your mind. This is an issue with your mind, triggering a physical response (your body feeling sick)

also about the part i wasn't sure about:
if you know what will happen next how do you not know how long the feeling will last?
haha j/k

serious not sure:
1.personally i always know what i will be doing next... because i have it planned out in my mind before i do it, so it doesnt make sense to me when you say "i know what i will be doing next" because if none of us knew what we would be doing next, we would all be spasming randomly for no reason O_o.

2. Do you mean you cant really control what you are going to be doing next, it just happens according to the way you FEEL it will be going?

3. Your grammar, and what not kind of has me confused, so im sorry O_o