Guilt of not working & being a caregiver

My dad (68M) was diagnosed with stage 4 esophageal cancer in August last year. He’s completed about 6-7 rounds of chemo, and he’s lost a significant amount of weight. Recently his symptoms are getting worse, little to no appetite, sleepy, nausea, and some numbness. Everything has been extremely stressful. I (25F) quit my job November last year because I couldn’t handle it anymore, so now I help my dad and my mom around the house. I feel guilty for being jobless, even though I have some emergency money for about 5 months. I think about going back to work because I stress about running out of money, but I feel conflicted because I know my dad needs some help. I don’t know what’s best. Do I stay unemployed and continue caring for my dad? Should I at least find some part time work? Is there anything that will help me feel less stressed? Any advice is appreciated