What Is The Solution For Memory Loss, Dizziness And Shoulder Swelling After A Hit On Head?

I am 32 yrs old 5 ft 10 in 176Lbs. I don t smoke or drink. I had meningitis at 6 months old, a hernia removal and gallbladder removal. Been in four car accidents which caused muscle damage in my back. I hit the top left side of my head on a sharp corner of a shelf 10/18/201. I went to a urgent care facility to get treatment. The doctor diagnosis was a cerebral sprain she prescribed me some Motrin and Valium. I haven t gotten any better and was experiencing memory loss,dizziness, a bad head and my left shoulder is very swollen by my neck so I went back, then another doctor prescribed me mobic and told me I might have a concussion. The ER doctor oderered a CT Scan didn t find any thing abnormal in my brain. She sent me home telling me to take tylenol, motrin and the mobic. None of those meds are working I ve seen three different doctors and I m feeling worse everyday. What should I do?