Is erectile dysfunction caused by antihistamines (nytol/ diphenhydramine/benadryl) reversible.?

I've been taking nytol (diphenhydramine) on average for two nights a week for several years and my s are getting a bit unreliable and weaker. I am a poor sleeper but generally healthy (apart from being 2 stone overweight). I am a bit of a worrier as well. I have read that antihistamine use weakens s which is acceptable to me in the short term, but I am concerned as to whether this effect is reversible or not and that I may be damaging myself. Many thanks in anticipation of your responses.