I was extremely moody this morning, my coworkers noticed and now I feel embarrassed?

I'm diagnosed with manic depression, anxiety, and PTSD.

Sometimes I randomly get moody and don't want to talk to anyone because I hate everyone and I don't have a good support system. I use to not be like this but when my dad died last year... it changed me. I opened up to my family about how I was feeling at the time but it went south and now I've been dealing with my feelings on my own and have no one to vent to.

Anyways, out of no where I became sad because the 1 year anniversary for the passing of my dad is next Tuesday and all the flashbacks of what was happening before then and leading to that moment filled my head. I got angry because I feel like everyone has left me. Im there for them but they haven't been there for me. My dad was my best friend and all that i had.

So with all of that going through my mind, I was a little rude to my coworker. I felt embarrassed and bad afterwards... but he showed me where he and my other coworker were talking about how I wasn't in the mood for anything...

Is it normal to be embarrassed about this?

I was extremely moody this morning, my coworkers noticed and now I feel embarrassed?
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