TMI- best constipation relief

Im in desperate need to go. Its been 4 days and im backed up like you wouldn't believe. I've tried laxatives and all it does is gives me a belly ache. I've been drinking heaps of water and nothing. I have really bad hemerroids from labour and birth. I don't know what to do! Im scared if i poop I'm going to blow out my butt hole! HELP ME!