Help! I need to keep up with everything

Ok guys, help me figure this out. I’m a SAHM to 2 kids - 4 and 1. My husband is working a lot (upper management) and just cut back to like 45 hours a week but he’s basically always on call for phone calls and emails and he does stuff after work and mostly he is carrying a lot of mental stress about some transition stuff going on at work. He is exhausted and showing physical symptoms of stress. We are trying to figure out if he’s going to stay at this job, some things definitely need to change. In the meantime, I always take care of all the housework and make dinner and all so when he’s home he spends time with the kids and we go to bed. Our kids are not sleeping well right now, I handle the night wake ups but he takes them in the morning before work so that I can catch an hour or two of sleep. I am also exhausted. But I just want to do more for my husband at this difficult time, I’d like to keep up with absolutely everything at once so that home isn’t adding to his stress but I’m exhausted and it’s hard! My youngest is teething and both kids have allergies with everything blooming. I’m never super behind but there’s always something that needs to get done, laundry needs to be put away or there’s toy mess everywhere. Normal stuff. I just know that he loves coming home to a clean house and chores done- who doesn’t?! Anyone have any tips to keep up to the next level during this time without burning myself out more?