I'm only in my 30s and I feel my mental, physical, and emotional health has been in heavy decline.

My physical and mental mostly would've been related from heavy and long use of smoking, drinking, and drugs which I've all stopped, Attempts for my own life, to incorrect posture and apathy during my younger years.

My social skills is non existent I can't construct sensible sentences and have conversations to people anymore. Not that I was any good to begin with since I know I'm introverted but even then I had friends, enjoyed games, and now I've got no hobbies, no friends, joints cracking, bullied at work.

How can I slow down the process? And hopefully start to regain what I lost? I feel as if I need to start over again from basic aptitude tests - from and work my way up. Would anyone be able to recommend anything?