Thanks for posting your query.
Normal value of hemoglobin in men range 14.0-17.5g/dL, as you are having slightly high hemoglobin levels which may be due to smoking, living at high attitudes, dehydration
or any cardiac lung or liver disease.
Chest pain radiating to back may be caused by pancreatitis
,liver or gallbladder
disease, peptic ulcer
or cardiac ischemia.
You are advised to visit doctor and get your LFT, serum amylase and endoscopy to reach causative factor.
Hope it helps.