I started having slight back pain about a week ago on my left side, just a few days ago, had intercourse and it hurt badly on my lower pelvic area, then after that the pain has gotten worse, it hurts to urinate, have bowl movement, cough, stand, sit, about anything it hurts. I have slight dizziness, my left leg now is also having pain up in my thigh area.

It could be sciatica pain. The sciatic nerve root, which happens to have roots running in each butt area, down the leg, foot, and toes, could be pinched or irritated. When this happens, you can have pain running from your butt cheek down your leg. Sometimes it causes numbness in the foot and many more different things. It's caused by various things but the most common is a slipped disk. This mean that the a disk in between the spinal vertebrae has slipped out and puts pressure on the nerve which then sends pain down your leg. As a matter of fact, I have this type of pain. It's been about 2 and a half months now and it hasn't healed completely yet. I haven't been to the doctor but I think I might pay him a visit soon. Anyway, if you have this pain, get it checked out so you can get a proper diagnosis to help heal it faster.