Part time or full time, it’s a job that generates income. I understand that even if you only work part time (due to being on disability) you still rely on your income to supplement disability payments.
I have second job that supplements my day job income. It’s only 9-10 hours a week but that’s income I rely on for particular purpose.
What you can do is to ask your manager if you could get your hours back as you need the money. And if there is anything you can do to get more hours.
I command you for maintaining employment and trying your best. It’s applause worthy.