Been having trouble with persistent roundworms in my 3-4 month old kitten. She's been having on-off diarrhea as well as vomiting and now i think she's got blood in her urine. Could this be another symptom of worms? I'm worried they've caused internal damage She had blood in her stool one time about month ago, probably from the worms. I'v wormed her 4 times already why are the tablets not working!!??