Hi
Welcome to the MedHelp forum!
The symptoms could be due to low testosterone, anemia, diabetes, hypothyroidism, or due to kidney or liver problems. Another possibility is sleep disturbances (like sleep apnea, imbalance of rapid eye and non rapid eye movement sleep etc.). You may sleep your customary 7-8 hours and yet feel fatigued. You need sleep studies to rule this out. Other possibilities are chronic fatigue syndrome, depression, low Vit b12, low iron, low calcium, sodium and potassium.
Please consult your PCP for primary examination followed by proper referral.
Take care!
Oh i also smoke but even when i didnt smoke i still had a problem with shortness of breath.