Could certain conditions exclude me from being a Fire Fighter?

Yes, some of the "issues" you mentioned could exclude you from being a firefighter. As you say, it is very physically challenging career. Some consideration for the possible effects of the med's you may be making also may come into play. Have you made inquiry to any of the possible employers? Also, another thought, you can have your physician give you an "Arduous Duty" exam. That may answer the question for you!