I have similar conditions to you, and work in the industry.
Up front - I got sick while on the job, with about 10 years experience in the industry behind me. I was not able to sustain working normal / full time hours with my condition - after a time of recovery, I was eventually able to find a way to stay connected and working. And I know and have worked with others with long term chronic pain that are working in the industry in senior positions.
My main advice to you is to not assume that studios will not be able to make accommodations for you.
Focus on getting to know something very specialised, very well. Seek out fellow students that have similar passions and artistic interests to you. Prioritise social connections around you in your university as much as learning - people in the industry that know your work, your availability and want to work with you because you're a friend will be your biggest support as a disabled animator.
As others in this thread have said, freelance will likely suit you best as you get to decide your own working hours and can more easily 'work around' your disability. Working from home where you have access to all of your heat pads / ice packs / supportive chair will likely be something to consider.
Keep at it, value your connections, learn what you can, go easy on your body.
I don't know what the situation is in California/the US - but it is very much worth looking in to disability work supports. The very best of luck to you. It is possible.