Graciecat

You aren't going crazy.
I know...as I'm sure the rest of the people that post here do...where you're coming from.
In fact that's the first thing I said to the Doctor when I walked into his office.
His reply to me was..."If I know one thing, I know you're not crazy".
He told me he felt that it was probably panic disorder, but he did a zillion tests just to be sure.
When all the test were normal, then he told me that what I had was a very common problem.
Once I heard that, it was like a weight had been lifted from me.
Hang in there, go to a Doctor, if you haven't already.
You'll be fine, it might not feel that way right now, but you will be fine.