I took a half of an imodium (loperamide) 2 days ago to stop diarrhea. and now i haven't used the bathroom. and my stomach hurts. should i see a dr?

Drink plenty of: fluids, eat good quality fiber containing fruits, nuts and vegetables, avoid animal protein until back to normal. Delay could be to having "cleaned things out" therefore a delay while the GI tract gets back to functioning properly. A good high quality probiotic blend will be helpful in getting the good bacteria back in control.