I am really sorry you are going through this OP. I read your thread last night while sitting on the toilet crying!
I have had similar symptoms since Christmas Eve. It's awful isn't it?
I have had incredibly bad experiences with NHS GPs and UTIs in the past. After about 10 years I saw a GP from Sweden who was over in the UK on an exchange. He immediately said that dip tests aren't reliable, that growing cultures aren't reliable, that I needed a course of antibiotics to treat the symptoms and I needed to see a specialist.
I swear he saved my life, if that isn't being too over dramatic!
I saw someone at St Barts in London, a female consultant. Last night I completed a form to get my notes from the hospital as I can't remember her name and I can't remember the exact dosage of medication she gave me. Anyway, she gave me a dose of Cefalexin every day for a year. In this time I was also pregnant and the constant UTIs were apparently a problem for the pregnancy. The Cefalexin stopped the UTIs.
I do have yellow teeth, and my child has a line of yellow through hers which my dentist says are likely to be from he antibiotics.
Anyway it's been years since I had a UTI but this time I didn't bother going to the GP straight away. I am afraid to say I bought antibiotics on-line. I took a weeks course of nitrofurantoin which helped a bit but didn't completely sort the problem out.
I THEN went to the GP who said I didn't have a problem because dip stick tests showed nothing and they were very reliable and he wouldn't do anything else for me. He told me to drink more water, drink cranberry juice and take those satchets. I explained that a consultant had told me there is no medical evidence for cranberry juice working on UTIs, that she told me drinking too much would make me urinate more so that it would hurt more and that the consultant had advised against doing this. I also told him that the powders make the urine less acidic but they don't sort out actual problem. He wasn't interested. He sent the urine sample to the lab though. It was full of floaty bits!
So I went to the after-hours GP who said he'd been taught to treat the symptoms and gave me a course of Amoxicillin which I took for 5 days.
At the end of the 5 day course I got a call from the original GP who said I did have an infection and he would prescribe Amoxicillin for a week.
I went to collect these from the pharmacy and queried taking two lots of Amoxicillin. She thought I should be on Co-Amoxiclav but gave me the Amoxicillin anyway.
Back to another GP who grudgingly prescribed the Co-Amoxiclav.
The crying on the toilet in the middle of the night has been replaced by feeling, well, okish after having taken two tablets of Co-Amoxiclav.
I am seriously considering buying a years supply of Cefalexin from the internet and treating myself as NONE of the GPs will refer me back to the consultant I originally saw.
Although I might try to make a private appointment with Prf Malone-Lee.
Anyway this is a very long winded way of saying that you can buy antibiotics on-line! I know you haven't had a positive culture, but we also know that a negative culture doesn't mean that you haven't got an infection. Maybe it's a foolish thing to do, I am not sure. I think you should know that the option is there though.
Anyway OP you have my utmost sympathy.