M.P.
Of course quitting your job is scary! I wanted to retire but I was still quite anxious about doing so. You're leaving one way of living and managing money to start another way that you've had no experience doing.
I suggest that you can overcome some of your anxiety by putting down on paper the financial knowns. Plan a budget that you can see has the possibility of working.
Some of your anxiety is self-produced by you focusing on your anxiety as anxiety instead of an opportunity to reassure yourself that this will work. Accept that you are anxious. Don't try to push it away. Say to yourself that it is normal for you to feel anxious. Spend some time just being with your feelings. Then repeat some positive words to yourself such as, "I know I'm anxious but I also know that this will work out."
You may not believe this at the beginning but the more you repeat it the more real it will be. Also say to yourself something like, I love my husband. He loves me. He's reliable. I can trust him."
This is one of those times that you mostly have to let go and let God. Substitute any word for what you believe in. higher power, the universe, etc. We do have to learn that we cannot be in control of large portions of our life. One of my favorite sayings is also, "everything happens for a reason and it always works out." Perhaps or maybe not even most of the time does it work out the exact way I want it to work out but each event is an opportunity to learn and grow. We have to let go of having things a certain way before we can feel comfortable in our lives. Once we can be flexible life does get easier.
I wish you success! I do know that whatever happens it will be OK!