Hi, there, sorry for your disease and I am so happy to help you. For your questions, i would like to answer.
1. Antibiotics are commonly used to treat prostatitis, but it is not a natural treatment as it will bring harm to your kidney and liver. You can try the herbal medicine DIURETIC AND ANTI-INFLAMMATORY PILL. It is a natural treatment for prostatitis
2. You can take a PAS to get confirm
3. Antibiotics are not the only remedy, herbal remedy is also prescribed
4. It is not life-threatening, but it will cause much damages if left untreated such as infertility.