Need help: Am I hurting myself by overreacting ?

I’ve been telling my husband that when it comes time for me to start our next IVF cycle, that I want there to be no distractions, please make this moment a priority and safeguard and protect your time so you can be there for me and I can feel supported as it helps with the stressful emotions. A little background: We had already gone through one IVF cycle that was heartbreaking every step of the way I had severe complications that left me very sick, hospitalized and infection ridden. He’s a very supportive husband, he’s been there every step of that journey. Needless to say tho things were overlooked and because of that we switched clinics. I was advised by a new doctor that in order to have a fighting chance to ever have children of my own I had to undergo another surgery to remove my tubes. My condition is so severe no doctor wanted to do that for over a year and a half I was left in the dark. Until one day I aggressively asked for referrals to have a surgeon operate on me. I finally got a willing doctor. My husband somehow had to make an emergency trip out of the country and missed my surgery as well as my initial intake appointment at the new IVF clinic. He didn’t fully disclosed to me as to why it was so important to make that trip except that he had no choice. Something to do with land ownership dispute and his parents were also involved. Surgery was a huge success :) Fast forward 8 months, I’m about to start a egg retrieval cycle at this new clinic, and I’ve made it very clear to my husband “prioritize” “no distractions please” and the week of he hits me with “I need to fly out of country to take care of this day in 2 days time.” My body is immediately in fight or flight mode, emotions stress levels are up the roof, I’m screaming and crying how can he do this to me again? This is not the time, I need him here with me, especially after how traumatic my first IVF experience was. For knowledge: egg retrieval from start to finish takes on average 10 days, beginning with the start my period. My husband’s return date is one day prior to my estimated egg retrieval day. That means I’ll be giving myself injections alone, driving myself to appointments alone, but most importantly stressed out if they move egg retrieval even a day earlier, he won’t be physically there to provide a fresh sample of sperm for this IVF cycle. My egg reserve is extremely low as is, my AMH is 0.5. I’m 34 and endometriosis ravaged my fertility. My husband told me he could not delay attending the issue, it was impossible. I’m so upset that he sprung this upon me at the last minute, he said it sprung on him also last minute. It’s not like I have the luxury to keep delaying. I’m running out of time for my fertility. I know the right thing to do is delay this for my next period because the stress levels are just too much atm. My husband already left the country, and with all the traveling he’ll be doing in 14 days he’ll be tired and stressed his sperm won’t be the best. I’m just so hurt and I don’t know how to manage my stress and emotions at this time. I truly felt everything was falling perfectly into place and this was our month. I can’t seem to forgive him for this.