Hi Tired
At first welcome to this particular forum.
Sorry to hear that your having so much problems with your fistula.
Myself I have a really small one that hardly gives me any problem but I think you should consider trying another med. Some say Tnf-alfainhibitors as Remicade and Humira works well for thouse that have this problem as they keep your crohn in balanse. For me Humira does the work for my Psoriasisartritis but unfortunally not for my crohn.
And about
the weight issue, some say that when your overweight you don´t heal as godd as when your not. I don´t know if that´s a fact or not. I just know how hard it is to loose weight when sick if yournot loosing weight beacuse of D, then it easy a bit too easy
Wish you best of luck!