When my mania's beginning I start to feel like I can do more (as I can't do much at all when I'm depressed), I have racing thoughts....more than I can deal with , I wake earlier and can't get back to sleep , I feel the need to do 101 things at a time.
Sometimes I think I can take on huge things (which in reality would crush me). I obsessively try to do things perfectly , usually cleaning and symmetry (I used to have quite strong OCD symptoms which over the years have lessened , although I have never been diagnosed).
I have also been diagnosed with Anxiety & Panic disorder.
I hope this has helped answer some of your questions.
Take care ,