Not sure what to do

I feel like everything I say or do just makes my fiance irritated. I am insecure, especially after having a baby and a lot of the times when I do show that I'm insecure he gets annoyed. He says it's "constant", which, it is but most of the time I don't even ever say anything or do anything to show him that I am. And not only that, but like everytime I bring up something that bothers me instead of saying something that would be beneficial he just doesn't seem to care and gets annoyed instead, and in turn I apologize for annoying him because I'm scared of abandonment. Today, we were doing sprints and I have heart problems. I call them "episodes" where my heart will palpiate for up to a minute to 10 minutes and I'll start blacking out, but I've never passed out yet. I had one while we were doing the sprints, said I couldn't do it anymore, told him that my heart was having an episode and ran inside to lay down so I wouldn't pass out. He stayed outside and kept doing the sprints, and when I came back out I told him how close I was to blacking out, and that it was one of my longer episodes. He ignored what I said and we did more speints and went back inside. I just asked him why he doesn't seem to care when I have my episodes or at the very least ask me if I'm okay or check on me. He just said "well you're always fine after aren't you" all annoyed. He said i have yet to pass out after an episode and because of that he doesn't see the point in making sure I'm okay. Like am I crazy to want my fiance to check on me or at least as if I'm okay when I was seconds away from passing out? I don't understand it and it makes me sad