How to dig myself out of this depression I falling into?

The past three months of my life has been very stressful, and I feel myself going into a depression and I don't know what to do. I've lost three friends due to suicide, my girlfriend and I had a miscarriage, my sister and I got into a big fight and haven't talked since thanks. And I myself feel like I haven't been the best boyfriend for my girlfriend ( even though she says I have). I was past over for a promotion that I believe I should have got. I haven't been eating as much as a should. I don't know what to do to get myself out of this depression. I've tried talking to my best friend but that's not helping
How to dig myself out of this depression I falling into?
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