I have lower abdominal pain, and the rectum is uncomfortable, Is it a prostatitis? 
I have been treated with anti-inflammatory medicines, but no good results.

They are prostatitis symptoms, but the disease can't be exactly diagnosed only according to the symptoms. You need to take some tests. 
To cure prostatitis, tcm is better than antibiotics in most of cases. They can completely cure chronic prostatitis which can hardly be radically cured by antibiotics. Also tcm can be safe, they seldom do harm to organs. 
Diuretic and Anti-inflammatory Pill is the one I recommend, you may have a try.                                    
Released in 2011-07-08 14:49:32