Thanks for providing more information.
As per your description,possible differential diagnosis may include Renal calculi(stone),Urinary tract infection,Irritable Bowel syndrome,Nerve impingement at lumbosacral spine.
You should drink plenty of fluids and start cranberry juice.
Also take OTC Tylenol.
You should apply warm compresses with a heating pad on affected area.
Gentle massage with topical analgesic ointment on lower back can provide relief.
You can try over the counter medication called Cystex that you can buy at places like WalMart for a few days.
If your symptoms'll persist more than 3-5 days then make an appointment with your nearby doctor.
In case,pain is severe then visit ER.
Hope this helps.
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