Excessive thirst, frequent urination
and unusual fatigue(frequent tiredness
) are associated with a lot of diseases like Diabetes mellitus
, diabetes insupidus and other endocrine disorders, elctrolyte disturbances, Urinary tract
infections etc., for which you need some blood investigations and urine analysis to be done. Since you have mentioned that anaemia is corrected fatigue due to that may be unlikely...
Constant fatigue may produce depression
, on the other hand depression per se can produce the symptoms of fatigue, excessive thurst which in turn excessive urination, stomach pains , etc. So it needs to be evaluated...