I have side effects after taking tamsulosine?

I have side effects after taking tamsulosine. I took it because of urine retention. I had one box 2 years ago and still have major problems. Bigest is erectil disfunction, with pain in muscle im whole body, stuffy nose, constipation, noisiea… What can i do to improve my function? Can alfa agonists help? Have you heard of similar problem before? Can you help me somehow, because nobody can? A im healty in all diagnose..very depressed

Age: 34
Male
Medications: None