wits end..need suggestions

i am 48 and my husband is 71. we have been alot together, he had a liver transplant 3 yrs ago. it has been difficult..or so i thought but now i am at a loss.. he has parkinson's, he doesn't realize how hard it is for me (i work full time, we have an 8 y/o daughter). i'm at my wits end, i can't be with him 24hrs but i can't afford full time help at home? pls..any suggestions????!