I'm so sorry this month didn't pan out for you. In all likelihood, your lower AFC is just a fluke and things will be back to normal in August.
I hate it that you may have to cancel your vacation plans, though -- that would really irk me! Maybe you can squeeze in a shorter mini-trip for yourself sometime soon? Vacations are important, especially with all the sacrifices we make for IF treatment.
I find unforeseen treatment detours like this to be one of the harder aspects of this whole IF experience. The stress & worry, the readjusting of the plans. These things seem to really get to me more and more over time.
I am rooting for your success in the long run. Keep you're chin up and stay strong!!