Why do I feel so tired and irritable all day?

Its definatley not bipolar, that's clinically defined as rapid swings in emotional state. Like going from happy to livid like switching a light. You're over stressed, and mildly depressed. You need to get out at meet people, check the local paper for groups that intrest you like a chess club or book club, dancing, whatever. Make friends, its imperative for survival. Sleep, is important. I suffer the same way, but there is help, before you hit the hay, relax yourself, lay down and take deep breaths to relax your body and mind, so when you fall asleep your mind isn't running on about the day. There's also a tea called sleepy time, its green tea with chamomille, it relaxes the central nervous system so the body can rest more sound. Lack of scheduling causes stress to your mind and body because its unwired from no structure, so try and make some, go with your average work pattern, and tailor your sleep schedule to that. The stress and anxiety is why you want to vomit, because your body is way out of synch. As for the abscess, your dr shouldn't have just dismissed it, because there are infections that don't easily manifest in just a simple blood run, if they aren't looking they won't find it because they barely check for anything besides enzyme levels and cell levals, seek a 2nd opinion, you have a right to, because you might have something wrong, and your body is reacting. Take care and best of luck