I know we've had our differences on account of your appalling choice of political party, but:
1) agree totally with Rowan - get sleep sorted first. Your body needs it, and it also sounds like you would benefit from being awake and (preferably) outside during daylight hours. See a doctor if you can't get it under control.
2) I have had the same feeling of being a bother to everyone, but like you say, on an intellectual level you know it's not true. All you can really do is hold on to that, and if you're getting that vibe specifically from someone, you cold just ask them. It'll be awk as f**k but you'll feel better when they tell you you're being an idiot.
Good luck!