Extreme Fatigue. From last 4 years.

Hello! Dr. From 4 years I am feeling extreme tiredness & constipation. 3 years back it was reported thyroid and from than I am taking eltroxin 100mcg everyday and checking it quarterly. It's fine and normal. 1st 3 month was extremely fine but after that extreme tiredness again started. I checked everything including BP, SUGAR, VITD, VITB12, Anti TPO consultant 3 ENT & NEURO PHYSICIAN too. All report are fine. There was some Allergy that I took Montair FX 30 days. Now in last visit my uric Acid is 7mg/dl. Doctor has advised to take Febutaz 40 for 2 month. I am 32 years, 5'7" tall & 74Kgs, nature of job is sales & marketing (traveling). I feel all the time tired and I feel my eyes are like burning & sensation in eye, all time want to sleep only, weight is increasing everyday, can't focus on anything. I don't ve any job, family pressure to think. I checked with all the reputed MDs in Bangalore. I would like to request to suggest something i am tired of taking medicine from last 4 years.