Side affects are immediate relief from anxiety, depression, and PTSD. Also it's a fun as hell experience. Ketamine is a hallucinagin as well as a dissociative (it'd a fun trip, I was scared of hallucinagins but turns out a lot of that scariness is just effective D.A.R.E. propaganda). Lasts about an hour tho the afterglow/come-down is nice. The day of, assume you'll be out of it till bedtime and you might need to take it easy the day afterward.
I've had treatment resistent depression since middle school. It flipped something in my brain. I've recommended a lot of people to the local place and everyone has had great results. I had been hearing for a long time it was a miracle drug and I completely agree. I was never able to get my hands on it tho until treatment places started popping up.
So yeah, if you can find a place to do it and afford it, give it a shot. Worst case you'll have an interesting experience. I prefer the intramuscular to intravenous for official treatments.
^Quick PSA: If you decide to DIY (yay American Healthcare), be sure to get testing strips cause any white powder might have fent in it! Testing strips are often free to get most places and better safe than sorry^