Struggling with Job Stress and Disability

honestly..... I'm stressed out a lot more than I let on. my job has been cutting out the part timers ( like me) and adding more tasks to what we already have to do. I'm disabled so 3 days a week is the maximum I can do without a severe burnout or mental break. I'm also on disability so having less than 25 hours a week scheduled doesn't mess with my current payment because they expected and planned on me being part time with less than 3 days a week. but now there's this constant worry of me losing my job because they keep trying to call me in on my days off to cover for the call offs and now that I'm the only part time person it'll fall on me but like I CAN'T handle it mentally or physically.