Hi OP. Ok first of all, anxiety is pretty real as you know and this isn't down to laziness here as you've managed to raise 6 kids which is way more work than a part time job. Your husband won't totally understand this though as he doesn't have anxiety and he won't totally get it. Unless you experience it, it is hard to understand.
I suffer too but I've always held down a job. However, when I had my only ever break from work for maternity leave, I got so anxious at the thought of going back that I became physically depressed and ill with anxiety. I did go back but life was tough. Everyday I would wake with anxiety, every day a sore stomach, sore head and the odd panic attack as well. I think with you, being out of the workplace for so long has probably made your anxiety worse and the thought of going into a workplace is just too much at the moment and you can't calm yourself down, leading to panic attacks.
You obviously want to turn this around and you haven't asked for this but anxiety comes with so many physical issues as well to the point sometimes you can become physically ill with anxiety.
Jumping right back in isn't going to work for you OP. You need to ease yourself back in slowly. Perhaps sign up for a work course a couple of hours a week first. Something quite early in the morning so you don't have too much time to overthink it all.
I highly recommend kalms lavender capsules. Take one a day and it really does take the edge off.
There is no talk of anyone leaving so shelf that for now and work on you. Work on building your confidence and calming the anxiety so that in the future you will be back in the workplace. That is the aim not the immediate goal. I feel this maybe an ultimatum from your husband to try and push you but little does he know, this will probably make your anxiety worse.
Find some groups and talk to people and get tips. Most of all, find a job that you will enjoy and one that is quite early in the day as to not over think.
I feel for you OP. I hope you can get things sorted and my advice will help you