** 1. pain during micturition is suggestive of vesical pain while stabbing pain points towards urethral pain so in best interest consult an Urologist who will ask for general blood picture [routine], urine for culture sensitivity [if trimethoprim is sensitive or not] and cytological examination, and straight X-ray examination [which may give clue to the diagnosis] and perhaps excretory urogram. 2. tvt [tension free vaginal tape] means you suffered from stress incontinence so avoid anything which increases intra abdominal pressure such as coughing, laughing,rising from a chair,bending, defecation. 3. Using trimethoprim together with sodium citrate is safe but with potassium citrate it may increase potassium levels in the blood causing dangerous hyperkalemia [you may ask your Doctor regarding the symptoms associated with it] in the mean time take plenty of water/fluids, avoid spicy/hot food and watch for vaginal candidiasis during antibiotic treatment.