Hi, sounds like you've had quite a time of it lately. I can only give you my opinion, but I'm always happy to try and share some moral support

I understand what you're feeling. Hugs
But am I being silly?
Do you feel as though your feeling are silly? If you do, validate your feelings and make them ok. You can never have a feeling that is bad or silly or unjust. If the feeling is there, it deserves to be paid attention to no matter what the feeling is. You have the right to your feelings.
Should I pull myself together?
Sounds like you are trying. Now, in my opinion only, if you are missing work because of depression, if you are not sleeping because of depression, if your are miserable because of depression...you really should visit with your counselor or Dr. about change/receiving treatment. If you can not live a normal life, you are not getting the help you deserve. It takes awhile to find the right combination, sometimes but keep trying til you do.
You have the right to a life outside of your home. Missing out on work is missing out on life and that is not the way it should be. So, if getting treatment for a better life it "pulling yourself together" than yes..you should. If you're already fighting with all your might then you know that and don't worry about what others think. But, you still have the rights to your feelings, no matter what...sad, depressed, angry, withdrawn etc.
I mean I havent been through much have I?
Depression hits for many reasons. Physical, psychological, life's happenings and no reason at all. Life's happenings are really not an indicator on how whether depression occurs or how severe it is. Depression is a chemical imbalance of the brain. It is a physical disease just like high blood pressure, or insulin resistance or hypothyroidism. You need treatment to balance the chemicals. No body, but you knows how bad you are feeling. No-one has the right to compare their life and depression with your life and depression. We are all individuals.
Work friend says that it was directed towards all of them but I KNOW it was directed at me.
Hmm, maybe...maybe no. That would be something only the one who said it would know for sure. Take the positive road. Assume it was a general statement. And, fight back. Get well. Prove her wrong, at least where you are concerned.
I tell you something though if I had that little b***h in front of me now i wouldn't be doing SI thats for sure.
What is SI?
Hope maybe you're feeling a bit better today. Hugs to you, Lendi