Good to read your doing ok!

First rule indeed never panic in those situations. Your right about the danger part while doing extreme sports. Everyone is seeking that thrill but you can't think all the time about the things that could happen. That's why you need to be focused when things did happen en you need to solve things. When you panic there is no focus.

Told you already but will reply here to maybe others have something about it while reading my comment. When you got under your sail and you want to get away from it but all you grab is foil, foil and nothing but foil. You don't know where to swim, and that's where the panic starts usually. So DON'T panic! Try to find a batten while your there underneath the water (or the boom, actually the best tip is never let go the boom while your falling/crashing, it will keep your gear away from your head to). The battens are there at the full width of your sail and usually with a distance from approx 70-80cm between them. The best part, you can feel them although you couldn't even see a thing underwater. When you find one, just follow it either left or right it will end somewhere.

If you're still hooked in the harness, it's even easier. Try to position yourself inline with the boom. The distance from your head to your hook + the length of the line is way longer than the distance from the mast till the position of the lines at the boom. That way you can catch a breath while you can unhook yourself calm.

After that don't stop surfing. Just get on the water (yes @surfermarly just like you did my hero! 💪) and have some fun falling in the water again. Falling isn't a failure, it means you're learning new things!

Hang loose 🤙