Hi, Kev,
I want to begin by telling you you're not crazy. Our human bodies, especially our brains, are so complex that doctors and scientists still don't have all the answers. In the meantime, don't give up.
Get referred to a neurologist.
Keep on seeing specialists until someone can help you.
That's what happened to me. Like you, I experienced some strange and usual symptoms. But the first few specialists with their tests couldn't find anything wrong. I also thought I was going crazy and thought about giving up and considered suicide. Thank goodness my GP didn't give up on me and referred me to a neurologist. It took the second neurologist to finally diagnose me with a condition that is quite rare, 5 in a million.
So please don't give up. Have hope. It's the best medicine of all.