Havent took a dump in two days have to go but can't what should i do?

Laxatives: Sounds like you need a laxative. There are many choices. One of the best is prunes- usually 7-8 medium sized prunes will do the trick. You can also take 3000 mg of vit c every hour until you have results. Other choices include milk of magnesia (magnesium hydroxide) and laxative teas like smooth move with senna or cascara sagrada. More fiber and fluids help prevent constipation. Let your doctor know about your problem.