Hi Marian,
I couldn't sleep last night and I'm up very early. I hope that you did finally get some pain relief and some sleep.
I know you're worried about your daughter and you've got a problem with your knee. Rough times for you!
Can I suggest this? Even if your daughter does have MS, although she's going to need emotional support, she won't need physical support for a long time yet. You'll both have time to make a long-term plan.
I don't think you need to plan to move closer to her in the short-term. Your own problem with your knee is more urgent. Get your knee fixed, finish up working for the length of time you need to for retirement, and then think about moving.
Once your daughter is over the initial shock and the first appointment with a neurologist, let her know that you trust her to deal with this like the adult she is. Emphasize that getting your knee fixed soon will mean that you can give her better support later, if she needs it.
I know it's a mother's first instinct to rush to the rescue - heavens, I've done that enough times with one of my sons, but I've learned that sometimes stepping back has allowed him to grow in confidence.
I do hope that you don't think I'm interfering, but I can imagine you tying yourself in knots, trying to do too many things at once. Hugs!