Has anyone ever heard of a lower abdomen virus?

So not to keep everyone reading forever, I've been dealing with some severe lower back pain and flank pain for the last 4 or 5 days. I went to the Dr. and they gave me some antibiotics and told me they had no idea why I was having the pain.

It was not getting better so last night I went to the ER. The ER doctor took blood, urine, did a CT, and an X-ray. He assumed I had kidney stones, I was praying for NO kidney stones. I've heard horror stories. Anyway, he comes back and says no kidney stones, no kidney infection, no kidney failure (phew), and says I have a viral in my lower abdomen -- has anyone ever heard of this?

Oddly the remedy? A shot of steroids in the ass. I feel tons better today.

I just wanted to share and see if anyone had a similar experience?