Sleep really will help. I get angry/irritable without it!!

Meditation used to strike me as being really a hippie holdover and kind of dorky, but as I get older, this stuff really does help. A simple exercise is when all of these thoughts crowd in, let them come, don't stop them, but then let them pass by. Trying to keep a "blank" mind is a lot harder than it sounds but it is a useful exercise to calm down.

Sometimes being in a dark room with only a candle flame can help you focus and "go blank". It really is just for times like this where you just don't want negative thoughts to amplify and amplify. A short term measure but useful.

Leave room for hope if you can.