It sounds like you have some type of connective tissue disorder. I have MCTD (lupus, scleroderma and polymyositis) and had many, many tests before diagnosis. Bone marrow biopsy was one of them to eliminate cancer or a bone disease. My early symptoms were mild anemia and low platelets. Later on an elevated sed rate and other test indicators but it was obvious by then that I had lupus at the very least.
Diagnosis of any of these is based on many thing...symptoms, tests and no 2 cases are alike in symptoms or response to treatment.
Keep a list of all symptoms even if they do not seem related. If you are seeing more than one doctor make sure each of them sees all the test results so they are not working at cross purposes.
Not sure about your question on red blood cells but I have seen information on that...just don't remember what it was. Do a google search and go on both the LFA (Lupus Foundation) site and the TMA (Myositis Assoc) site for information.
Hope you can get some answers soon. It can be frustrating but these are complicated and highly individual diseases so it is not easy even for a good doctor.
Mixed connective tissue disease (systemic lupus, scleroderma, polymyositis), Raynauds phenomena, Hypertension, Barrett's esophagus.
Meds: prednisone 5mg, 50mg imuran, Lotrel 40/5mg, maxide 37.5/25mg, folic acid, potassium, aciphex 20mg, multi vitamins.
Maintain your optimism and you can beat the odds.
"Although the world is full of suffering, it is also full of the overcoming of it." Helen Keller