I had another (if maybe somewhat strange seeming thought). You said that you are ill yourself. Have you also lost a great amount of weight?
The reason why I am asking is that pets often take on the illness of their person. If this is the case you can talk to your dog and let her know that you deeply care about her but want her to live life to the fullest and healthiest and that there is no need for her to take on your illness and/or symptoms.
Dogs understand a great deal and often a heart-to-heart chat helps. Tell her that you love her dearly and that is why you want her to be healthy, fully functional and happy.