My husband has been taking Effexor XR 150MG SID for over 12 years and is getting to the point where he has no energy, cannot sleep, no motivation and lack of interest in anything. Recently, because of allergies, he has had to take Benadryl and I am wondering if that is interfering? Also, is there anything over the counter that can be taken to help him sleep because I think that is another large issue.