OP, you don't sound crazy to me. There are so many threads on here all the time from women who are worried about their children, starting from when they are in the early phases of pregnancy right up to when their children are adults. It's very common.
You do have to be careful that it doesn't tip over into anxiety. I do think it might be worth speaking to your GP about that. But I also think that some degree of worry is, unfortunately, just part and parcel of being a mother. I certainly worry a lot about milestones, and whether my DD is meeting them "on time", and what it means if she isn't. It's hard not to.
For what it's worth, everything you've said sounds normal to me. Certainly, as I said upthread, my own DD stopped making noises then one day started again. And most of the babies I know avoid eye contact when they're tired, and enjoy scratching things.
It's good that you've been referred to a specialist though as they'll be able to answer your questions and shed some light on whether there are any potential issues.
Are you keeping a list of questions to ask him/her? It might be a more productive way to channel your thinking. Every time you get a new "but what if...?" thought, write it down, then close the notebook, put it away and make a conscious effort to go and do something else. Keep that list ready for when you see the specialist.