FG, sounds normal to me. No, you're not losing your mind (as much as it sometimes feels like you are!)
I'm doing a FET cycle this month after an almost 6 month much needed break and I'm feeling anxious about the whole thing for a lot of reasons. There will always be some amount of anxiety when you're going into a new cycle, so I would say all the thoughts running through your mind, and the emotions are completely normal.
Just read your sig....I have my first scan for this cycle on Thursday too.