After I was in the outpatient emergency room of the RWJ Hospital, I was diagnosed with inflammatory colitis (a wall increasing in size in the right ascending colon and the transverse colon) from a CAT scan.
For about a week and a half, I started taking two antibiotics, one of them being Levaquin (750 milligrams) and the second one being Metronidazole or "Flagyl" (500 milligrams). The Metronidazole seemed to work a lot better then the Levaquin did, making it highly possible that it was a protozoa or bacterial infection. The symptoms of the inflammatory colitis I had was infectious diarrhea, trapped wind, severe stomach aches, headaches, constipation, and soreness of the anal region.
A few weeks after, I started drinking protein shakes and taking sports vitamins to gain weight. The protein shake was called RTS 51, acting as a food supplement, having 51 grams of protein in one can that I drank down all of at one time. The sports vitamins being GNC’s Mega Sports for Men, having BCAA’s (Branched Chained Amino Acids) in it, protein components, and other nutrients. I started having the stomach aches, constipation, incomplete defecation, and diarrhea a few days after.
Could this be a relapse of the previous infection, or something more serious? If not, what could it be? Should I continue taking the Metronidazole since I have some left? Please answer and best answer is ten points.

