Retrograde Ejaculation

We are pretty sure my husband suffers from RE.  About 10 years ago he had the urine and semen analysis done, the final test that would tell us, and the lab lost the results, which they had also done with one of his previous tests so we were very upset and didn't want to pay for an additional test.  He is the only man I have ever been with so I don't know how much semen is a normal amount and when I ask if he did more he says he doesn't know.  We tried over the counter pseudoephedrine but we don't know how many pills he should take or how long before ejaculation he should take them.  I have been looking for info on RE and some sites say that there is a surgery and some say that there isn't. Can anyone help with knowing how to use over the counter decongestants?  I would like to know what the best brand is, how many he should take, and how long he should wait after taking them? He is the only one out of his siblings to not have children yet and we would really like to correct that especially since his father has now passed away and we would like to name our first child after him.  Can anyone please, please help?