Thanks for your query.Based on the facts that you have posted it appears that you have urgency of urination with tendency to have UTI very frequently.
You have been taking antibiotics since a long time but gas with very poor and unsatisfactory results
Considering the chronic nature of your problem and poor results with antibiotics I personally think that you have Over Active Bladder Syndrome.
You can have atrial of drugs antimuscarinics like (Solifenacin
) after consulting your family physician.He will help you to guide about dosage and timing of the drug to be taken.