What to do?

The thing is I'm with depression since more than 10 years however after spending 1 year with my family and not going outside my house i started to "heal" myself and lets said that i have "improve" i still feel depressed but not with the same intensity but now I'm in a job which i mean i actually liked what i do , is close where i want to study like 2 streets and all that stuff but my work environment(co workers) is killing me.So I'm not really sure to leave or "grow" some balls and overcome that but i'm also in the fear to back to the sate i was mentally 1 year ago.