Suggest Remedy For Frequent Urination When On Detrol

I am a 66 year old very healthy and active (triathlete) who recently started to feel the need for frequent urination. The doctor prescribed vesicare which seemed to work for a couple of weeks and then I started to feel a slight burning sensation after urinating. I was on it for a month and then switched to detrol. Some relief and then burning sensation returned as well as frequent need to urinate. I ve just started enblex (4 days) and same burning (not with each urination but if I go frequently it starts. Should I give it time or switch back to the Detrol which seemed the best. Or are there other medications that I should try?