Hard to say what it could or couldn't be. I mean I think things never perfectly fit in one category or another. Being tired for examply really could be anything, from something life threatening to nothing to worry about... I have been diagnosed with autism and a metabolic disease. From your story I recognise having issues reading clocks (analogue ones specifically), being very tired, both caused by metabolic disease (not enough energy in my brain) and autism (getting too sensory overwhelmed). I do make random sounds as well, mostly it means I'm either very enthousiastic or well it just has to come out or so, just like when I have to squease something really hard, can't really control it.

When I'm very tired I forget a lot of things, get lost, can't solve or hold the easiest information in my brain and people might even consider me having some kind of dementia. I like people and really care about them, but my social skills are basically the opposite of who I want to be, as with all things it gets even worse with being tired. As for grades, mine have been great so far, but I don't even know how as I'm basically always tired. I wish I were better at living life and surrounding myself by others as well. It's like you've got so many things you want to share and show, but those symptoms holding you back to show the real you.

I understand very well you are looking for answers and hope you will find them. I do wonder though what specifically makes you wonder about autism and did you refuse the ADD diagnosis or the Ritalin (or both, and why?)