First always think of disease which u already have. U need to get thyroid
function test if not done recently. U also need to rule out diabetes
. dysfunction of any organ can cause all these symptoms. So better get ur liver, kidney
, lung and heart evaluated. Adrenal sufficiency is always a possibility. Pl get ur BP checked in sleeping and standing posititions , sodium and potassium tested and serum cortisol
at 8:00 AM.