Hi @twitt1949 I didn’t have MDS but had developed AML, acute myeloid leukemia. (MDS’s ugly step sister) My illness came on rapidly and within 3 weeks time I went from the first obvious symptom to being rushed to the hospital near death. Just a week prior to that I’d been snowshoeing through the forest in deep snow. So this came on very fast.
And yes, during those weeks, I became increasingly fatigued to the point where I had to be carried into the doctor’s office the day of my diagnosis. At the time of my diagnosis my hemoglobin was at 4.7% and my blast count was 85%.
To answer your question, I really felt like crud! LOL. I wanted my husband to call the vet to put me down.

We’ve talked about the fatigue before. If I remember correctly your red blood count is less than the normal range. So with fewer oxygen rich red blood cells in circulation, that is causing the anemia symptoms you’re experiencing with shortness of breath and fatigue.
Make sure you mention that to your doctor though she most like is aware by the blood result numbers.