I post at PC when I am feeling really bad. That is what PC is for, a safe place to vent. Sometimes you can look back at your posts and see patterns that you then can recognize when they start happening again.
Never feel bad about expressing your true feelings. Bottling them up leads to more problems. When I read your posts, I find myself wishing that you didn't feel as depressed but it is what it is. You might feel even worse if you didn't post here! Your venting could be saving your life!
When I first came to PC in June 2016 (Mysterious then some #), I remembered very well the deep depression that caused me to attempt. Reading you posts back then was helpful because it helped knowing others felt so suicidal. Your posts ARE very helpful. Please keep on posting.