Do you ever get randomly physically emotional?

Sagen

That sounds weird but I am not sure how to word it. I randomly will get a pit in my stomach, an anxiety rush (fast heart nervous feeling), or  I get that sad feeling. Odd thing is no thought is related to it. I am cleaning or watching TV then out of the blue pit in stomach. Or I am feeling fine then I feel really sad, no reason, no negative thinking even. I feel sort of kooky, am I alone in this.

ETA: I say physically because I am not sure how else to decribe it. It is like the thoughts or what is going on do not relate to the emotions or the physical effect ie pit in stomach.