Any point in a 30 year old applying for SSDI/SSI? In Georgia? [View all]

I'm "only" 30 and have heart problems that basically prevent me from doing anything that even comes close to raising my heart rate.
I also have crippling social anxiety, but that doesn't seem to be a disability according to SS.
I've already applied once, when I was 27. Took me 3 years for SS to deny me 3 times and basically ask why I even bothered. Had a lawyer, but he literally chuckled when I explained what was wrong with me, in our first meeting. He didn't even try and later simply gave up, without so much as a "I'm sorry."

So I ask, is there any point in me, a 30 year old, even trying anymore?
I can't work. It is torture to stay awake longer than about 2 hours at any time, due to the heart pain. I HAVE to sleep, as that is the ONLY thing that helps it. And keep in mind I'm in Georgia, red state hell, so even if I had no arms or legs, it would still be hell dealing with SS.