Have Any Dermatologists Seen Sexual Dysfunction or ED Associated with Accutane Use?

I'm a male who took a course of accutane from Oct 2012 to Mar 2013. 1 month off (April), I noticed I was having a problem with maintaining an erection. About 3 months after, my acne came back less severe. I started a second course at the end of June. My acne cleared within one month of each course. My sex drive has steadily tanked since then and I can't stay hard. I'm a worrier so this has weighed heavily on me. Has anyone seen this association? Am I making it worse by obsessing about it?