As per history you had been operated for hystrectomy 5days back and you are suffering from fullnes in abdomen and bloating
.After any surgery bed rest
is important, you can walk here and there but you should definitely not lift heavy weight and should not do strenous exercises.
The surgery involves handling of internal organs, which takes time to heal.
As far as burning urination is concerned, you might have some urinary infection, which should be ruled out by doing urine test.
get well soon
Dr Hari Om Chandrakar