In morning when i wake up there is no fever but slowly day progress there is mild fever between 99-99.5 f fever with knee pain and lower leg musscle pain with fatique which comes down to normal at night from past 2 months. All blood test are normal with negative skin test and AFB for tb , blood culture is negative ,urine culture and typhoid is normal , ANF,ACE,thyroid is normal,ct abdomin and chest is normal . Ultrasound of abdomin detect gall bladder stone (8mm) with  hepatomegaly. But having chronic constipation from past. Any diagnosis . Pls suggest me because i am getting fustrated .