I feel the same too, but mine is primarily PMS.
On Sunday, I stayed in bed all day, didn't want to see or speak to anyone, including my partner and was so happy, he spent the day out. I was also very nasty to him verbally.
I still feel miserable today and was really ****** off yesterday, as my partner went to collect his 11 year old niece from school, then proceeded to try and dump her on me. This infuriated me, as I felt in no mood to have to try to entertain her. People just don't understand.
Maybe you do have a form of depression, it seems so many people do these days and your state of mind and mood has been worsened by your bad news.
Although the alcohol will make you feel better initially, it will actually make you worse, as alcohol is a depressant. You should perhaps see your GP, but it's good you're continuing to go to the gym, as exercise can help.