Annegrl, I am SO sorry. It’s for certain that a care partner’s work is never done. I do have a few suggestions that may or may not he helpful.
I found Sensi disposable briefs to be far more absorbent than any I could buy locally and my husband, who was very resistant to being changed, NEVER once got a rash or sores. His skin remained very healthy. I ordered them from Amazon, worth every penny.
Regarding the loose stools, I know several people, including my dad, whose medication was the culprit there, especially Aricept. I encourage you to consult his doctor.
And, when my husband fell and we couldn’t get him up, and didn’t have help, I called the fire department, explained that it was not an emergency but did need help if someone was available, they sent a team out at no charge.
Blessings to you. This group and local support groups, possibly through your local Area Agency on Aging, can be a lifeline. Reach out.