Brief Answer:
You need to take a fibre rich diet

Detailed Answer:
Thanks for asking on HealthcareMagic.

The food matter moves down through our gastrointestinal tract as it gets digested. After digestion, the leftovers are elimiated as feces using the same downward movement of the gut. To ensure this, proper intake of dietary fibres is essential. You need to take plenty of green leafy vegetables. They contain plenty of digestive fibres which will ensure bulk formation of the stool as well as proper bowel movement and your problem will be resolved. You may also take dietary fibre supplements like isabgol (psyllium husk). Google out for fibre rich diet and you will get good recipes for the same.

It is also important to regularly walk in the morning in order to ensure proper bowel movements.

Regards

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Brief Answer:
You can take laxatives

Detailed Answer:
You can take some laxatives, no issues with that. In fact, the fibre supplements that I had suggested, act as laxatives.
Stomach flu is actually a layman's term. It denotes acute gastroenteritis or some infection of the gastrointestinal tract. It can lead to the discomfort that you are facing. However, taking natural Probiotics like plenty of curd or yogurt should be helpful since it contains plenty of beneficial bacteria for our gut.

Also make sure to keep yourself hydrated.

I did not understand what you meant by 'the 1st part of my ?...'

Regards

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