Oh Pinn, I am so sorry. I am nurse who worked ICU and saw many go through DT's. I agree with Juju, if someone does plan on quitting drinking like your father did, it should be managed in the hospital with the correct medications and protocol.
I wish for him to have a full recovery and really get his life back on track. I know dealing with an addict parent is very difficult. My mother died when I was 21, she was a coke addict. I never went to Al-Anon, but I probably should have, it might have helped. I have no siblings, my parents were divorced, so my mom was my responsibility at the age of 17-21. I know how lonely it could feel.
You'll date when you feel it's right. I'm in my 30's also, the upper end of them. You'll find someone who piques your interest and you'll realize you may be ready.