I did hernia sugary in my stomach (lower abs) 2 weeks ago.... when can i go back to gym ?? and what exercises i should avoid ?

Hernia surgery : Hernia repair surgeries can vary quite a bit. This is the sort of thing you should ask your surgeon.

Depends: It depends on what type of surgery. Was it open or laparoscopic? Any complications? Any pain now. Usually doctors advise no strenuous activity for about 6 weeks after surgery. If any doubt, talk with the doctor who did your surgery. Good luck!