If you are suicidal the best thing you can do is go to an ER if you have nowhere else to go, or go to your pdoc. Just go, please. Right now. Please.
There are lots of things you can do to help you get through it, if you want I can share how I deal with my longstanding depression, but please go get seen now.
Are you seeing a pdoc and on meds?
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PDD with Psychotic Features, GAD, Cluster C personality traits - No meds, except a weekly ketamine infusion