Depersonalization/Derealization

I want to hear from others experiences. I've been feeling dissociation and DPDR feelings alongside depression and anxiety.

I feel like I'm living on pause, lost my interests and feel not able to perform in any kind of job or hobby. I feel like I don't know anything anymore. The depression/derealization feelings and brain fog are awful. Things feel so weird, my own sensations feel weird. I don't feel present. As if I'm not here. Not feeling fully. It's so scary it feels like it's almost gonna get out of control.

Has anyone experienced the same things and got better and healed? if so how long did it take?

To note I'm 2 weeks into treatment with injections (gonna start the 3rd). First day I had a little better energy and better mood, felt alive a bit more with a mood boost. then the next days I've had weird symptoms that were probably a reaction of the daily injections and wake up symptoms (had insomnia, chest pain, etc) after a few days/1st week these got better. now I feel tired and depressed. Extremely depressed.It feels like it'll never end. I'm not able to do normal life stuff, have health anxiety, unable to feel joy at all and have LOTS of negative intrusive dark thoughts. I feel I'm trapped in a very dark place.

I'm looking for a slight hope in this hopelessness.