Hi, Mayfree, and welcome to Psych Central! Evidently you are someone who highly values sex as a way to feel loved and wanted.
It sounds like your partner does have some health problems which might affect her desire.
Maybe you can compromise and at least agree to some hugging, back rubs, etc. at the time when she is not interested. I know it's hard not to take it personally though, but I don't hear her saying that she no longer loves you. I hope the two of you will be able to work this issue out.