Hey, that's a super tough situation. Can't imagine your frustration. I don't mean to sound harsh or discouraging or anything, but if even drawing a single line gives you that kind of reaction; is it worth putting yourself through that? Is learning to draw really something you want to pursue? Be honest with yourself, my friend. How important is it to you? Art should be fun, not torture. Sure, it can be frustrating a lot of times, but if it's so painful for you that you literally need therapy because of it, then... well... maybe reconsider hobbies. That's all. If it is important to you to learn how to draw despite this, then I don't think there's any way to avoid massive initial discomfort. "Pushing through" as you described it. Although, of course, you shouldn't try to push through all at once and dive into a course. That would for sure make it worse. But you need to be okay with being uncomfortable, too, for a while anyway, until you can learn to relax a little. I don't know what techniques your therapist tried, but it sounds almost like a phobic reaction? Which I know from experience is a bitch to get over. I had a phobia of dogs as a child, which I eventually got over through exposure therapy, similar to what I'm about to suggest. But I don't know if this is something you've already tried, or if it would do any good anyway. I don't think it always works for people... I'm no psychologist. This is just something that's worked for me in the past. Maybe start with some zero-expectation moments every day for a week or two... just one or two minutes... 30 seconds even to start... where you try to scribble a little, doodle, make some lines, whatever, then walk away. Whatever you put down is great. Again, no expectations. Just like you might doodle while talking on the phone, if people still do that, haha. Don't try to make anything "good." Just relax and let your hand go loose and draw anything or nothing. The point is to gradually increase the time with a pencil in your hand every day until it's not so scary anymore. Only when you can approach a page without that debilitating reaction you describe would I consider attempting to learn again or push yourself in any meaningful way to get better as an artist. Don't get stagnant in this phase either, though. It would be easy to think you're never going to be ready. Again, ask yourself how uncomfortable you're willing to be to learn how to draw. You're going to have to dive in at some point if you want it. And it will not always feel great. This is a hard one. I wish you all the luck and perseverance you'll need.

Fear of the blank paper has struck everyone at one point, and the only solution is to just start somewhere. Think about it this way, making a bad drawing and learning even a little from the experience is far better than not even trying. After all that's what practice is all about, learning by doing it again and again.