@Blackcloud I studied two Bachelor degrees that were useless for getting into a career but wonderful in terms of studying topics that interested me and being able to get a sense of achievement. It is worth studying for study's sake. And uni's are very accepting of people being different. I like how at uni you can be just whoever you really are and (as long as your get your assessments done on time and avoid committing any criminal activity on campus) you can expect acceptance from everyone. It is very very different from high school.
Your health is the most important thing. People who sacrifice their health for employment end up suffering for it. Sometimes people have no choice, as they require employment for food and shelter, which are essential needs for health anyway. I'm so grateful I have access to the DSP to cover my basic needs. I'd much rather work full time, but life is what it is, I need a lot of time and energy to focus on my health.
If you think short term work suits you better, there are a lot of volunteer opportunities that are short term or just on an occasional basis. It is reasonable to just do a bit of occasional volunteering, rather than having to commit every single week and getting overwhelmed.
One thing with the DSP, you can get a bonus payment on top of the usual DSP if you are studying. Sometimes people can get NDIS support for transportation to and from classes too (it depends a lot if you can provide paperwork to prove your disability impacts on your ability to drive and take public transport though).