Like another Mom, I don't think you've "created" a night-waking child either....every child is different, and there are changes from one month to the next, I swear! You also make the best decisions you can with the info you have at the time, so don't beat yourself up.....
Why not just feed him? four hours seems like a long time to go between nursings. If he is in a growth spurt he could truly be hungry. Maybe coax less and nurse sooner? Sounds counter-intuitive, I know, but it might work. To me it seems less cruel than the "ferberization", just my opinion.
If you coax for an hour and then feed, you have lost that hour plus the time it takes to nurse him (which I commend you for, BTW). If you coax for 10 minutes and then nurse, and he sleeps, then you have only lost 10 min. plus the nursing time. Plus I can't imagine how nerve-frazzling it must be for you and your husband to listen to an hour of fussing. And baby will be calmer and more ready to nurse and settle down if he has only been fussing for 10 min. rather than an hour.
You could also think about starting him on solids if he is showing the signs for being ready for that (but don't quit nursing, he still needs that). If hunger is involved here, maybe having some solids will help him sleep a little better.
I may get all kinds of flak for suggesting this--would you consider sleeping with your baby? I found we (baby and I) both got better sleep when we were together. DH wasn't that thrilled, so it is something you need to discuss....
Good luck and let us know what happens!
K. Z.