I've been the primary caretaker for my 28 month old since we brought him home from the hospital. For the past 2 years, my day has been a flurry of feeding, changing, cleaning, and weaving doctor's appointments and daily in-home therapists' visits into the mix (he has Down Syndrome). Now, I also have my 9 year old home schooling virtually and my wife home working as well. It's exhausting, and me-time is non-existant, but I know when my little dude gets older, I'm going to miss this time where I spent every waking moment with him.
I get where you're coming from, it's definitely stressful, a grind, and it seriously tries the patience, but damn do I love being Dad, no matter what my kids' tempers throw at me lol.