OP, of course you deserve kindness, you are a person who is unhappy, everyone deserves kindness and empathy, and from what you have posted you give a lot of those values out to other people.
I'm not a Mum, but I learnt a lot from mine, she was physically very frail, but I knew she loved me and that was the most important thing. From what I know of kids they are great at seeing the truth in things. If Mummy isn't feeling well, she needs love, just like you give them. Being unwell does not make you a bad Mum and you haven't let anyone down.
Anxiety is the worst feeling in the world and it is so hard to describe it to those who haven't been there. There are times when you are so overwhelmed it can feel like it will never feel any better, I can promise you that you can.
Please be kind to yourself, when it is too hard, it's too hard, tell somebody. Take all the help on offer and don't for one second feel bad about it. It's for you, your DH and your DC's. Imagine one of your friends was telling you what you are telling us now and what you would say to them, I bet it's a lot kinder than what you are telling yourself.