I have a hard time napping during the day- scratch that I can't nap during the day. My anxiety makes it impossible. However the second I crack open a book I feel like I'm going to pass out. It's very strange.
Speaking from only my own last issues that were similar: I had a massive vitamin D deficiency. Was tired but had issues sleeping. Became depressed etc. Finally had blood work done/doc visit when I started having suicidal thoughts.
OP, just schedule a doc visit tomorrow morning, plz.