What Causes Dull Pain In Lower Abdomen With Bloated Feeling And Lightheadedness?

Hello, than you for taking the time to read this and answer. I have had Diverticulitis in the past and thought last week I got it again. Had dull pain on lower right side of stomach that moved up and over to the left. So has to be my large intestine right? I was put on two antibiotics 6 days ago and it seems to have helped a bit but when I eat sometimes I get bloated and most of the time I get light headed. I also sometimes get nauseous. I am trying to eat easy to digest foods and drinking only water. But I figure after 6 days on the anitbiotics that most of the symptoms would have gone away by now. I am able to go to the bathroom as usual, no changes, not actually vomiting though sometimes I feel like I might. I do get an appetite after not eating for a few hours but again I am tying to eat easy to digest, low fat, low sugar, meals.