Postpartum 12 weeks , 2nd grade episioto

Second grade, episiotomy, difficult birth on 5 June. Stich completely gone confirm doctor after Times visits. Stich gobe but gap open , later closed weeks ago by using placentra gel , then perenium incision line skin tore twice , 1 after sex and 1 after workout. Then took medicine to stop bleeding. Now it's been weeks ago everything closed , doctor checked vaginal canal no problem. But I'm still feeling little ache perenium , and my Vagina why get tore easily , had sex second time , no tore , just soreness. I don't have pee or poop problem. But my butt while muscle ache especially when I sit little longer and stay for long time . My inside vagina (not perenium) get sting and itches sometimes when it's get wet my sweats etc .. so why vagina is sensitive, why perenium still ache and why my whole butt get ache very easily ? What to do ???m