Saturday night I had bad stomach ache (thought food poison), but no vomit or diarrhea. Sunday, lower back ache and sensitive skin (skin sensitivity usually means flu for me). Slept 6pm-6am. Loss of appetite because stomach feels kind of bloated. Today, stomach still feels achy and Had rectal pain like internal hemorrhoid ache. When I went to the bathroom to urinate, my panty liner had a greenish yellow color. No smell, no itch. Is this a UTI? At 53, I have never had one, or cant remember, if I did