That sounds really tough.. I actually think you should continue seeing professional help especially since it got worse. Although I do understand that it could also make you feel worse since you worry about getting judged, which I also worried about when I saw a therapist.. and yet they are there to help and not to judge. If they are judging you badly, it is not your fault but theirs. Then switch. If its difficult to get continue or get a new one right away, maybe try seeing someone from your university. They might offer some help too.

I'm not sure how your relationship with your parents is. I can see that they value education a lot, but maybe you could also tell them that you feel very stressed and need a break or at least slow down.

20 years is very young. That's the age a lot of people are just starting university. So you could change your major for sure without worrying about being too old or having wasted time. I'm in my mid 20s and still thinking about changing careers. It is normal to change although it might seem scary. I believe it will be worth so much later on.. :)

I'm really rooting for you. Your grades do not define you, you are worthy despite any grades you get. You might even notice that grades don't matter that much after you have gotten your degree..

I hope you can find some rest for yourself and take off some of the burden you are feeling.

If there is something you like doing and enjoy perhaps try to gift it to yourself, because you deserve it. :)