Dark urine often indicates you may be dehydrated, or maybe just on a bunch of vitamins – but pain is an important signal something else is goingg on. Drink a LOT of water to help flush the area, throughout the day. Cleartract Juice in warm tea should help. If you are not an alcohol abuser or allergic to NSAIDs, also take an Ibuprophin for inflammation and pain. Take Vitamin C (or drink EmergenC) Avoid sweet stuff; and above all, go to Planned Parenthood, a County Health Clinic, or see your Doctor TODAY. They’ll give you a fast Test and prescription for Antibioticss, and possibly a pregnancy test and other STD tests if you have been sexually active.

Follow their Rx instructions exactly, take every one even after you see improvement. get informed to protect yourself! Ask, and Google, about sexual health – and communicate about safe and unsafe touching it to anyone with whom you may be intimate. Back to front touching may have caused your infection and partners can change the way/places they touch to avoid spreading bacteria. It’s Ok to speak up – they won’t want to do anything that could hurt you. (If they do not adapt, stop seeing them – there are better people)
References :
http://www.webMD.com, http://www.plannedparenthood.org/