Fatigue , exhaustion. In morning?

I am 35 yrs old male. Since 6 - 7 months i am having this issues. No matter how much i sleep in morning i am always exhausted in morning. When i wake up i feel my all muscles and joints stiff and sore not typical pain. Fatigue and exhaustion are so severe that cant even get up Sleep is sometime disturbed but still 6 hrs sleep. Fatigue is not propotional to it. It is way severe Following reports done and its normal:- Ecg , echo B12 , d3 , magnesium Cbc Hb= 13.2 ANA , HLA B27 , RF , ANTI CCP ALL NEGETIVE Crp , esr normal LFT AND KFT usg abdomen Mri spine Serum electrolytes Urine and blood culture Thyroid profile Sugar profile Mysthenia gravis antibody Allergy testing Tb gold test All normal What can it be ? My local doctor saying it can be chronic fatigue syndrome ? Is it ? Why it cause so much fatigue even after sleep and joint soreness in morning ? Pls solve this queri