You are far from being the only person who feels like this. I've also got my own 11 month old, and she is the most delightful little monster I occasionally want to chuck out the window.
As others have said, parenting is hard. And that's in regular times. We're parenting in a sodding pandemic. We've virtually had all support stripped away from us for the past few months. Being unable to visit or be visited by family, no baby groups, no classes, community services becoming non-existant. Before I had my baby, I never understood "it takes a village to raise a child". I bloody well do now.
You are doing wonderfully. You might not feel like it, but you are. You obviously love your son, and he adores you in return.
Advice time:
Ditch the changing table. Put the mat on the floor and change him there, it'll be so much safer and less stressful for you both. If DS gets too overwrought and wriggly, let him loose, and have a little crawl around. I've found sacrificing speed for less stress much more worth it. There's been a couple of stray wees, but nothing worse than that.
When you say DH has DS until 9am, is that to allow you to have a lie in? Does he help in the night? Does he take DS for any other time in the day? Forgive me if I'm wrong, but I'm getting the impression that other than that period in the morning, you're not getting any time to yourself. That needs to change right now. After DD goes to bed, if she wakes within the first couple of hours, it's DH's job to resettle her. Those couple of hours are protected me time to do with as I wish.
Are you returning to work? While I haven't yet, I'm in full agreement with PPs that that time away is invaluable to helping you feel like yourself again. If not, then is there any chance of getting DS into some childcare? Even one morning a week will make huge difference.
If you haven't already, lower your standards. A bit of CBeebies every day won't hurt either of you. Independent play is a useful skill for any child to have, and should be encouraged. A bit of dirt is good for boosting immature immune systems. DH takes out DD for a couple of hours every Sunday so that I can blitz the house. The rest of the week, I have neither the time nor the inclination for anything other than keeping on top of the essentials, and DH helps with that.
It will get better, I promise.