Can any kind soul help suggest what these symptoms may be? I've taken 17 year old DD to GP on average once every 8-10 weeks, but we're no further forward. The GP keeps suggesting it's thrush and gives her canesten which doesn't work, and the swab comes up negative each time.
It's really affecting her wellbeing 
Dd has been having thrush-like symptoms on and off for years, but near constant the past 2 years.
Fluctuating symptoms including:
- stinging during urination
- inflamed vulva (blotchy and bumpy spots)
- stabbing pain in vulva
- nausea
- fish-like odour
- lower abdominal and back pain
Symptoms are usually worse around monthly periods. She has been trialling various contraceptives to control the symptoms, but they're not having any effect.
Never been in a relationship.
Does not use any scented bath and body products, and laundry detergent is non-bio.
Can any kind soul please help 