Belly Issues

Ever since we put Braydon on formula he has been having issues with his belly hurting him. The first time I took him to the dr. about it they thought it was from him having reflux issues so they put him on Zantac. They told me it could take a couple of weeks to help him. After two weeks he wasn't having problems with reflux anymore but he was still fussing a lot and spitting up a lot and I could tell that his belly was still hurting him so I took him the dr. again. This time the dr. switched his formula to Similac Sensitive because he thought he might have a lactose sensitivity and the formula is lactose free. At first he seemed to be doing ok but after about a week he started fussing again and we also noticed that he was crying from about 7-10 every night and still having belly and spitting up issues. Because of all this we unfortunately had to cancel a trip we had planned to go up to Cape Cod to see our family. We didn't really feel safe leaving Greenville knowing that Braydon was having belly issues. We also have been extremely tired because of not being able to get much sleep at night so we didn't think it was to safe to drive for 16 hours with the kids in the car. Once again after about a week on the formula Braydon started to get bad again so once again I called the dr. and he told me to switch his formula to Isamil Nutramigan, which is the most expensive stuff. So far he is doing ok and he has been one it for a week now. We are also convinced that he has colic and the dr. has this suspicion has well. But the new formula is supposed to help this as well. I just hope that he will start doing better and that his colic goes away soon. They say it usually does between 3-4 months.