Nickname, chronic stress (I think you have some) can affect you in strangest ways possible. Before I was diagnosed with burnout/adjustment disorder I thought I was bipolar (I think I even created a thread in the Bipolar forum). I had mood swings, but all of them were triggered by the things that were happening to me (Bipolar mood swings are mostly external factor-independent). I took a bunch of online tests for bipolar, depression and anxiety and all came back with "You are likely to have that".

I am not saying that you don't have a "real" mental condition, all I am saying is that you should rule out that what is happening to you is not just the effects of chronic stress first.

Here is a TED talk where the speaker compares burnouts to PTSD