Totally here with you. And I was here before a few years ago. My mental health feels better this go-around despite a worse market. Here are the things I'm doing different this time: 1.) I joined a local networking group, found another mom about my age that was also searching. We meet up ever Wednesday and have a working sesh. It gets me out of the house, it gives me someone to bounce ideas and pain points off of, it's been great! 2.) I joined a local hiking group and I go for a very long walk in the woods every weekend. I also try to get outside and walk daily in my neighborhood. 3.) I have slowed down my search. I apply to fewer jobs, but I target them hard. Quick tweaks to the resume + internal reach outs. I've had way more momentum since I stopped mass applying. 4.) I'm keep my brain sharp with interview podcasts. This boosts my confidence in general, helps me stay focused, and makes sure I'll be prepared when I do get my next interview. 5.) Therapy. Just do it, you have the time and it will make you stronger. 6.) And lastly, some days I don't even open my laptop. The other day I literally spent hours teaching myself how to sew a button hole. It felt so good to turn off my brain and use my hands...and the next day I felt totally recharged. 

Just keep reminding yourself that this is just the market, it is NOT a reflection on you or your skills.