Can Amphetamines Cause Erectile Dysfunction?

I decided to take amphetamines and I m on them from only 4 days but it s hard for me to erect and my penis seems like shrunk and also my libido is very low compared to before taking it. It s just like I simply don t need to have sex with my girlfriend from it. And that is not the real me. Before the drug, I had a problem with very high libido... If I stop the drug now, will everything go back to normal or I made a great mistake and I will suffer forever ?