Hello...my name is Jill. I have been in pain for a couple of weeks in my abdominal and pelvic area and visited my doctor, very reluctantly, on Thursday. I do not go to the doctors unless under dire circumstances. I do not like taking any medication. I am 64 but consider myself healthy. On my visit, my doctor set up a CT scan for that day, fortunately and the results the following day showed an acute case of colitis in the sigmoid? colon, bowel and rectum. I was told that I had to take an antibiotic which scared me to death!!!...as the last one I took was 16 years ago, apart from 3 lots of rocefyn? injections over a period of 10 years. I was prescribed Flagyl.......500mg x 3 a day for a week. I am completing my second day and feel dreadful to say the least. I know that I have to finish the medication in order to get better but wonder how. I wondered how long it takes for the medication to level out in the system, or does it just get stronger each day? My heart is beating faster than usual and I have much discomfort on the right side , going into the groin which began yesterday after my third tablet. I want to complete this course but would appreciate your imput. I feel very weak in myself and have little appetite. I would like to remain positive but do not feel at all well. I have one more tablet to take today that I have looked at for an hour!!