Idk the comfiest I've ever been but the comfiest I've been in recent memory happened just a few weeks ago.
I suffer from general anxiety and depression (who doesn't these days) as well as struggling with addiction. and was going through a seriously tough time resisting the urge to relapse and give in to my addiction. I was very close to giving up when somehow I stumbled across a picture that I took one day hanging out with a friend and a girl I had a crush on, it was a fun time and a good picture and we all looked so happy, and a very comfy warmth washed over me. Suddenly the urges to give in to my addiction had no power over me and I felt at peace and even joyful despite the cravings and all the shit I was going through at the time
So sorry you had to endure that brother, hope you're well now