I am so proud of you....you are on the right track. True giving is when you don't diminish yourself. That is from the I Ching. You will have no regrets because you are doing the right thing.
I have just been in not quite a similar situation. My neighbor Ron who I took care of his bedsore for thirty five days starting in January and wound up starting to get one and half hours sleep a night because of the stress and had to go on more medication, a few weeks ago treated me badly. He followed it up with another minor incident. I stopped calling him. I did call him the other day though when I was told he fell out of his wheelchair three times and was trapped for an hour and half and then he might also have had a minor heart attack...bad chest pains and shooting pains in his arm....After that phone call I won't call him again. I have done a lot of other things for him but I have to take care of myself first before I can care for anybody else.
Otherwise it isn't true caring....
Bobby