Hello @tonytenor and welcome to Mayo Clinic Connect. You will notice that I have moved your post into an existing discussion on redundant colon to help you connect with others who have some of the same experiences, potentially.

Members such as @jcarndt @darcystaples @lasirvent and @tropicbev may have some additional ideas to share given their history.

One thing that I immediately thought of with regard to your concern with weight gain is if you are doing cardio alone and/or the same type of cardio, it may be benefitting you mainly from a heart health standpoint and not as much from a weight loss/maintenance standpoint. Have you tried incorporating some weight exercises to trick your body back into weight loss mode?