First of all is it only weakness or you are also getting fever
, body pain
, loss of appetite ?
How has your sleep been?
If you do not have any other accompanying symptoms then most probably it is exhaustion after work.
You can definitely continue cobadex
forte once daily for a month.
Slight yellowish urine after vitamin B complex supplements do occur at times.
Also see that you are drinking enough fluids and is not dehydrated.
However if you also start visualizing yellowish sclera (eyes) and your fatigue
continues then you might need further evaluation.
In that case you might have to do: Complete blood count
Routine urine examination