Prostatitis and back pain. Medication?

I am a 40 year old obese man. I have following symptoms Frequent urination, urine retention, weak urine stream, pain after urination, erectile disfunction, constant groin and scrotum pain. Lower back pain, pain in both legs and knees, constipation with narrow stools, heaviness in my stomach. My PSA level is 2.3. I've done my prostate and dorso lumbar spine MRI. Attaching both reports. My urologist has said multiple times that I have prostatitis. Even after this my head keeps circling back to prostate cancer since these symptoms are all listed under prostate CA as well.  I'm going through this anxiety since last two weeks. How do I address this? Why is it that I have constipation? Why are my legs and lower back paining? Why are my symptoms not going even after 2 weeks medication? There are many questions hovering over my mind.