You had flu in January and it was treated. After that 2 months of time has elapsed which is enough for recovery.
You are telling that your urine is darker than usual, slight fever
always; these dont seem to be afterflu effects.
We need to rule out hepatitis
, reduced appetite,fatigue
,not feeling well will be the symptoms along with yellow discoloration of eyes and skin.
Contact your physician to rule out same.
Eat nutritious food, fruits, leafy vegetables.
Drink plenty of liquids. Choose water, juice and warm soups to prevent dehydration
. Drink enough so that your urine is clear or pale yellow.
Take rest in between to rejuvenate yourself.