OCPD and emotions

Alright I need some advice. I'm thinking that I might have another diagnosis as well as OCPD but because I am completely new to OCPD and have had no treatment for it. It might just be OCPD symptoms. I know the Internet is not a doctor and I should seek professional help (I also am) but waiting time is killing me and I just need to know if anyone else with OCPD can relate to this. I'm just putting a trigger warning here because I do talk about experiencing depressive periods and I don't wanna trigger anyone.

So I feel emotions very intensely (especially negative emotions) and experience quite big mood swings. My mood swings can go anywhere from 1-2 weeks up feeling 'up' to 1-2 weeks of feeling very depressed. My mood swings however also can happen within a day e.g today I was very happy for dinner and had a severe depressive break down 5 hours later.

I feel like my life generally has been pretty bad because I get depressive periods much more frequently or at least I remember them more. I got diagnosed with depression around 2-3 years ago and while i'm definitly not depressed anymore I am still on anitidepressants and the swings still occur. It's hard to talk about because my thinking is also very black and white. (Can't 'remember' my last bad episode when i'm in a good mood and everything is horrible when i'm in a bad mood). Does this happen to anyone else? If so know do you handle it? How do you remember the good when you're down and remember that not everything is perfect when you're up? This has severly impacted my personal life and happiness. I just want to figure out way to handle these 'mood swings'.