Breastfeeding struggles

I'm a little over a week pp and I'm struggling with breastfeeding and knowing what to do. Right now my right side has a milk blister and my breast is always hot, red and burning. breastfeeding feels like I'm being stabbed with a knife. pumping doesn't hurt as bad but still is not comfortable. Not to mention I'm getting less than 5 hours of sleep a night and am completely drained. I don't really want to stop breastfeeding, I've been pumping so my husband can help me catch up on sleep and so I can give my right side a rest. Should I keep going and if so how do I fix my painful side or should I give myself a break and start formula feeding?