Hello, I would suggest you to completely relax and not worry about it. Feeling dizzy and early fatigue on walking is a common symptom with anaemia(low hemoglobin count). Low hemoglobin count in blood decreases your capacity of red blood cells in your blood to carry oxygen, so your brain, muscles and other parts of the body has decreased oxygen supply, which manifests as dizziness and fatigue Low platelet count causes bleeding ( only if it is too low i.e. below 50,000) and hence anemia and fatigue. It doesn t cause dizziness and fatique directly. As you said the doctor has already done your blood tests and they havent suggested it, which makes it very unlikely for you to have leukemia. For your information the cells count in blood increases in leukemia but they are immature. If you were my patient, i would have asked more about - for how much time you were experiencing these symptoms. - was it associated with nausea, vomiting(bloody or nonbloody) - for how much time you have the diarrhea and what is the frequency - have you notices any swollen nodes - have you got any bone aches? - have you noticed blood in stools and color of stools - CBC Hope i have answered your question. If you still have any doubt, I am happy to help you with that. Meanwhile if you do not have clarifications you can close the discussion and rate the answer. WISH YOU BEST OF HEALTH!