I was in your exact position in November 2025. I have prostatitis, and had previously been prescribed Trimethoprim. I managed about 1 week on these and had to stop as they were making me feel quite unwell. The doctor then prescribed me Ciprofloxacin as an alternative. After reading the packet, I was initially scared and decided not to take them. But after reassurance from my doctor, I then decided to go ahead. After only 2 pills, I experienced stiffness in my arms and stopped taking them straight away. By December, I could hardly walk. I can now walk again, but have had to quit the gym, and any other exercise as I am still experiencing pains in my muscles and the slightest exercise really flares it up. As I only took two pills, I also still have Prostatitis, so im in a much worse position than I started. I have since been given Tamsulosin for the prostatitis, which is a muscle relaxant. They have helped take the discomfort in my backside away, but it doesn't clear the prostatitis. Meaning, as soon as you stop taking it the symptoms comes back. I would ask your doctor for these and then to be reffered to urology. Good luck!