I know I've experienced similar bouts of irritability. I guess it's part of my depression. Sometimes I feel really blue and other times I'm terribly short tempered and take offense at everything.
People that work in this field understand this. Don't let it stop you from talking to them. It may not seem like it helps alot at first but I found that it really did help.
i've done much better since taking medication-- it's not perfect- but what is!
Remember you are not alone- there is help for how you are feeling.
Hang in there-- I hope things get better soon.