I Normally Have Daily Bowel Movements, But Last Few Weeks

I normally have daily bowel movements, but last few weeks I have been constipated. I drink a lot of fluid , eat a balanced diet with fiber, and exercise 3-4 times a week. I have tried taking Selena -s daily and since continuation has gotten worse, started taking miralax daily with no result. After 5 days no bm I had to take and enema which produced a small result, long thin bowel. In the last couple of days have also had swelling in both legs which goes down by morning and comes back as day progresses. When I eat and drink my stomach becomes distended. I am not nauseated, nor having abdominal pain other than a little burning in the lower abdominal area which has been intermittent and presence for the last month, ans was told it is cystitis.