Hello DIEHARDS,
If you are having prostate problems you would feel like you need to pee but have difficulty doing so. You would be getting up a night a number of times running to the bathroom with urgency and when you get there little to nothing comes out. This would due to an enlarge prostate which many men have. Pain in the lower abdomen could be a part of the large intestine. You may have blockage there or have indigestion and gas formation. This will cause pain on and off and in fact it can make you feel quite uncomfortable. When you feel like that, I'm sure you would have difficulty getting an erection. Try taking a laxative (all natural) to see if that helps clean out the large intestine and stop the lower abdominal pain you are experiencing.