40 male in great health. Some questions. RBC was normal, Platelets Normal, Hemotacrit was normal, Hemoglobin was 18.4 on a range of 17.7. Any concerns as other tests normal. No smoking and no high alt...hemoglobin was 18.1 in 2016 on range of 17.7.....i have migrains from sinus and allergy.....a doc was told me i have thick blood....should i be concerned