Hi, I'm not really dealing with the same thing, but we have a medication-related issue as well. My DH has to take a medication which maintains a transplanted kidney, but it also kills off all his sperm. So, almost two years later, we've got nothing. It's not really the same as your DH being unable to ejaculate, but it results in the same problem.
We've just found out that his dr has agreed to switch his meds to something that won't kill the swimmers. There's no promise that it will work, but it's something. Is it possible to change your DH's medication? Are there other factors affecting his ability, like 'performance anxiety' or is it just the medication? I hope things look up for you guys. At least there's always BnB for support! Good luck!