<s>[INST] Hi, I am a 27yr old female who has struggled with have extra large red bloodcells and want to know what might be wrong with me and what might be causing this.I do not drink,My folate levels are fine,my b-12 levels were very low 3 years ago but we corrected that and i get them checked regularly,the are always fine.I am not anemic,my doctor is puzzled by this and can not figure out why.I am terrified of having something seriously wrong with me and worried i am being misdiagnosed,please help!I also go through frequent spells of dizziness,feeling faint,muscle weakness/stiffness,fatigue,chest pain and abdominal tightness/pressure and i feel like i cannot get enough air. [/INST] Hi, dairy have gone through your question. I can understand your concern. There is many causes of large WBC count.  It b12 or folate deficiency, alcoholism live disease are the common cause.  You should go for liver function test.  You're all symptoms are not related to your large RBC you may have some other disease also.  You should check for cardiovascular disease also. Consult your doctor and take treatment accordingly. Hope I have answered your question, if you have doubt then I will be happy to answer. Thanks for using Chat Doctor. Wish you a very good health. </s>