AnnMarie,
I'm glad you're looking for answers to help yourself. You're lucky to have a highly rated treatment center nearby. I think you should definitely go there for an evaluation.
There can be many reasons for fatigue other than low blood counts or a disease. They include problems with sleep, diet, exercise, or side effects of medications. Perhaps pain from psoriatic arthritis is wearing you out. In any case, make sure your doctors are aware of the symptoms you're experiencing, how often, and how severe.
If you ask 10 people about the ideal diet, you'll probably get 10 different answers, but the starting place is a generally healthful diet. You'll find diet discussions for MDS patients in these forums and you'll also find advice at other sites like the
Athritis Foundation and the
Mayo Clinic.