Not sure if this would work, but could you express some breast milk, so your DH could bottle feed him to give you a break? A bottle with the small hole, so it takes longer for your bub to feed Or don't you think he would take a bottle?

Can your community nurse or a dr give you some advice on what to do? My dr's given me some great tips (perhaps cos she's a mum too).

Hope you get yourself some relief and rest soon