What could be causing my urine to have a strong ammonia smell? this has lasted about a week already

Possible UTI: Given you gender and age, this could represent a urinary tract infection (UTI), which is usually associated with urinary frequency and burning. In addition, the ammonia smell of the urine could represent breakdown of urea in the urine to ammonia. You should see a physician to have a urine sample taken for examination and culture.