Oh, I can definitely relate! I have the same feelings. I over-think every little ache, pain, EVERYTHING. I started worrying about yawning too often one day. It's ridiculous! I keep thinking, oh what if this is because of *insert disease or serious problem here*. And then I worry about just dropping dead & leaving behind my family, my young daughters. It's very sad.
When this started back in February, I went to some pretty dark places....worrying constantly. I've been able to improve my thinking somewhat over the last month. It's so hard, though. I, too, always wonder what if my body is trying to tell me something? It sucks.