A month ago, i sat on my testicles, it was very painful. i saw blood in my seamen later - but not in my urine - . now i have erection problem amnd have law sperm. what can i do? please?

You had the semen analyzed so you have been evaluated by a doctor. All your described symptoms are not uncommon at your age but if you want a thorough assessment, you should see a urologist. Good luck.

This is from local trauma and will gradually heal. You have injured anything permanently. Erection problem is from worry it will go away. Try wearing a support underwear to prevent such accident in the future. Good luck