Trouble performing and IUI

Just needing to vent. My DH and I have been TTC for 2 years, have had 2 mc and are now in our 2nd medicated cycle with a fertility specialist. Our doctor recommended IUI along with other meds but my DH feels very strongly against IUI and told me so over the summer. I brought it up again last week after the first cycle failed and it started an argument because he really doesn't want to do the IUI. I get it. I really do. But I know we also want a child and wish he would just move past his discomfort. Anyway, the last two times we BD he had trouble staying hard. And all I can think is really, you had one job! And if you had just agreed to the IUI we wouldn't be having trouble!! But no I'm keeping my silence until this is all over and we can go back to sex whenever we want without pressure. I know it's a lot of pressure on him too and that's why he's having trouble. But if he just agreed to the IUI we could have sex whenever and without worrying if this cycle we did everything right :/ anyone else in this boat? Am I crazy for feeling this way? Thanks ladies!