Would it help your foot to heal if you had one of those little scooters that you place your knee on and keeps your foot up off the floor? I am so sorry to read that your foot is still giving you a painful fit.
You are a fighter, but your have a heart of gold and you give me the impression that you would do anything for anyone if they asked you for help. Don't be afraid to ask those same people for help. You are not in this world alone and it's time that others come to your aid.
Now about your father, what is wrong with him? He says the remodel is a gift and yet presents you w/the bill. Does he think that you should be kissing his feet because he did this? To me, he is way out in left field. I do not understand him at all. Why even do these things for you and then talk about how much they were? Is he trying to guilt you or make you beholding to him? I just don't understand why and how a father would exhibit this behavior to his child, much less, his only child. I wouldn't worry too much about him being angry. He's the one that needs to get over himself. If he didn't inquire as to how much it would cost, then that is on him....not you.
Hold your head up, back straight and always look in that mirror and know that you are a wonderful person who has and is continuing to work hard, provide a home for your daughter and yourself. You have done all of this on your own. Be proud of what you have accomplished and continue to accomplish.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.