What Causes Difficulty In Maintaining Erection?

Hello, I took jack3d in november and december of this year. I had difficulties getting and maintaining an erection, it was pretty bad. I usually have not had an issue in this area, but still today, in may, i am having trouble getting natural erections ie when i masturbate i can get one, and i also wake with morning wood. I should also mention that i suffer from recurrent depression, but i have not been on an ssri until about a week ago. not that that will help me in this area much. but any insight is greatly appreciated.