First time poster here
looking for some reassurance....
A month or so ago after experiencing sharp pains in what felt like my right lung, I went to the docs who referred me for an ultrasound to rule out gall stones (all clear) and then had a blood test, A week later I received a text from my surgery advising I’d need to repeat the blood test in a month. So I went for my re test today and asked the nurse why I needed another test and she said my red blood count was high but that she isn’t a doctor and couldn’t explain what that meant, only that it was 5.20 which was high.
Now after using dr google I have freaked myself out
and am worried it could be lung related or even cancer of the blood!! For reference I am overweight 27 year old smoker... 
Has anyone had this result before and if so, what was it??
Thank you in advance 