I Am Having High HB Level And It Affects My Eyes.

Hi, C 30 years old male with no major medical history except chroititis in my eyes 7 years back which got healed completely. I had severe para typhoid when I was 12 years old and had to be on medication for almost 6 months. My Father is a Diabetic however my sugar level is well in control. I have been diagnosed with high haemoglobin level. I came to know of this when suddenly one day the vision in my left eye got hazy. My right eye was however perfect. I consulted a Retina Specialist. She performed a Fundas Agiography on my eyes and found that there is severe swelling in the blood vessels in my left eye which was blocking my vision. She asked me to get a completed Blood test done. I got the tests done. The results are as follows, ESR - 2, PT-13.6, INR -1.04, BT- 2 min, CT-5 min, RBC - 5.63, Haemoglobin - 17.7, Hematocrit - 51.4%, Platelet count - 138, WBC - 6.0. After the test still she could not locate any infection. I was further advised to do a EPO test. The result is - 10.3. She still could not find the reason. I have been advised to consult a Haematologist. I feel heaviness in my head some times, my heart beat goes up occassionally and I can feel that. My breathing also goes up some times even if I am not doing any heavy work. I sometimes forget things as well. My Hb has been going up for the last 6-7 months. 5 months ago my test showed a HB level of 16.8 and before that it was under 15. What could be the reason and What should I do?