Sex is also a mind thing. If she sees and feels you caring about her and her needs during this difficult time, I would suspect once her medical problems are leveled out, all that love will be returned. There is nothing like having someone by your side and just understanding during a difficult time. You don't need to fix things, just listen and be there for her. If the low sex drive is medical related, the pay off for getting this sorted out could be wonderful. Hang in there, you have come so far!