To go along with the "you haven't handled your ig for a month?"... You haven't cleaned him out for a month?!? My guy poops every day and has to be cleaned out! He's getting trained to use a water/litter box, but I'm still in there every day. I may not pick him up and take him out, but I always scratch his chin and give him a back rub, and touch his feet!
My only suggestion is to carefully clean him out as best you can, and work on re-establishing your relationship with your ig. If he's small, there's no real safe way of catching him, if he's larger a damp teatowel works for me, but all you do is damage your relationship with your ig further. Even if all you do is scritch his chin and touch his feet every day, and take him out for full handling a couple of times a week, it will keep him tamed up.