Your symptoms are different; they are not due to the after-effects of Dengue
fever. It most probably seems like you have intestinal worm infestation.
Consider taking a course of deworming medicine like Albendazole
. Please get them prescribed by your primary care
The irritation feeling around the anus is also because of this.
Take a diet rich in fiber and drink plenty of fluids orally.
Hope you get well soon.