Declining health, increased death among caregivers. Any feedback?

I am in my Master’s degree program for Nursing ( age 55 and finally I’m about to finish my last degree )...is there anyone who could share their experiences in their health declining or death of a caregiver before the family member dies they are caring for ... I wonder what effect the stress and lack of sleep , and constant worry over money , increased loneliness, isolation has on the caregiver. I’m deciding if I want to do my thesis on this topic, but I need some insight and some examples.  I care full time for my mom who has Alzehemiers and dementia when I am not working at the hospital for my 13 hour shifts as a clinical supervisor. I come home after a 12 hournshift and I am so exhausted I can hardly feed Mom and put her to bed. I now have the caregiver staying to help me with this at night, except on my days off and I do it all myself. I purée all of mom’s meals, buy her ensure by the truck load, change her every 2 hours ..all my standards as a RN I should do. I also am severely ill with the autoimmune component of Psoratic arthritis, so I am on the chemo methotraxate and iv remicaid every 4 weeks and my critical levels of vitamin D. But I just keep plugging along everyday. I stay home all, day and change Mom at night when she needs it get her a ensure pudding and a ensure to be sure she’s not hungry. She has no bedsores and her labs are perfect. But I become exhausted and cranky sometimes and I miss my sister who died 4 years ago. I have severe grief of her sudden death at age 49, anyway that’s my story in a nutshell. But please give me your insight on premature caregivers deaths and do you feel the isolation has a lot to do with it ? I find this subject very interesting and would love any stories or feedback you can offer. I’m hoping my thesis will help others and maybe make a difference in how the struggles and isolation and stress of caregiving is viewed thank you so much. I love you all and I hope your holidays are merry.