Co parenting vent/advice, sorry so long

My ex-husband and I co-parent 50/50. When the divorce was finalized, we agreed on switching every other week. So every Sunday at 3pm it's the other parents week until the next Sunday at 3pm. I hope that makes sense. And during whosever week it is, that parent is responsible for the kids and their needs (so no one pays child support) and I assumed that meant the babysitter during work hours too. It was my gramma, and she was okay with watching them during his week as well because she loves them and he paid her for his weeks. My boyfriend and I paid her for our week as well.) I am currently pregnant and this pregnancy is pretty rough on me. I worked in a factory and had to quit. The kids are with me now, even during his week while he's at work, because he won't find a babysitter. Don't get me wrong. I love them to death. But the only time I don't have them is when he is at work, during his week. I have them every day all day during my weeks and all day while he's at work (11 hour days) on his week so basically all the time. When do I get my break? I mean, if I'm gonna have them this often, I want to go back to court and get full custody or whatever where he just has them on his days off or something. Am I wrong for feeling this way? I asked him about getting a babysitter and giving me a break and he just yelled at me and told me to stfu and got so angry at me... Is this my pregnancy hormones or do I have a right to be upset?