Suggest Medication For Pain In Left Side Of Buttocks And Leg

Hi, I am 31 years old, female. Last week I had this really bad pain in my left buttock. After riding in a car, the symptoms got worse and I had pain from my lower back down to my heals. After a day or 2 in bed I felt better, But the next day I had a really bad pain running down the left side of my leg. Also, my buttocks started to lose their feelings and also in the genital and anal area. Also having a bit of a problem using the loo. Is that very series?