Offered Job, Not Sure Can Work & Care for My Mother & Myself

I asked about a really really good job that is only a few minutes from the house I live in with my mother. Part time but with benefits. Even as part time I would make around $40k a year. They are very flexible on hours and me checking on my mother. Which is huge for me. Given the circumstances though I'm not sure I would hold out physically or mentally to do all of it. For example, I told them I could come in today. I got up early, my mother got up early, but she didn't sleep last night but a few hours. So I was up at same time. I was bound and determined to go but I just didn't feel like I could. Plus my mother hasn't been well the last few days. So althought down the road a few minutes I wasn't sure I could or should leave her. I honestly just didn't feel like I could start the job today. I was in a constant run for 3 hours prior if I had went to the job. I ended up having a IBS attack. I also have a seasonal business that I'm trying to run still. This job though would (if it worked out) take care of one of my fears... not enough money.

For once I feel like I should think of myself. I have others tell me to take the job I won't find another like it (they are right) but they are not caring for a bedbound person... by themselves no help. I would need to leave for 30 minutes to check on her and change her. When she goes into the hospital, what then? So many what-ifs. They say I am putting her needs above my own. I know that but not sure I can physically do all this. If it gets me so run down I can't do both what position will I be in then?

Would appreciate any feedback. Am I wrong in what I am thinking?