tryin hard - I understand EXACTLY how you feel. I'm also sick of BFNs every month. This is my last resort too. We could probably afford IVF, but DH will never go for it. He has 3 kids already from another marriage, and feels that "It will happen if it is meant to be". I had to do a whole lot of convincing just for Clomid - he thinks that's screwing with nature too. I just turned 38. DH won't let us keep trying past this year.
I wish I had more encouraging words for you, but know that you are not alone. Be angry, be upset, vent as much as you need to. hugs.