Here there is a local program where you can get paid to donate plasma. Problem is, half of the time I go in my heart rate is too high so they don't let me donate

Now I'm healthy, normal weight, etc. so I know it's not all my fitness to blame. Damn nerves...
Anyways, I was expecting to use that source as income. My boyfriend and I recently moved into our own (and his first) apartment together and I'm trying to do what I can do be supportive with paying for things, since he said he "wouldn't support me" (coldhearted in my opinion, but hey at least I have someone, gotta make the best of it!). So now I'm stuck on what I should do. From what I could figure out, I could either find a job (lol right) or get my GED and try to get into college. Getting into school would take longer, but since my parents are deceased I can only assume I'd get a decent amount of financial aide (and hopefully enough to support my income). As for the job part, I'm stuck. There's a limited amount of things I could actually do, and do well. That means I can't deal with customers, that stress would just about give me a heart attack. Any ideas on where to look for work or any other advice about finding income? Have you been through anything like this?