one of my nostril remains blocked and i used to breathe from only one. what to do?

You could try doing saltwater washes on both nostrils (beginning with the one that is block) this will unblock your nose and help you feel better.

You can buy on a drug store saline nose drops or you could do it by yourself with tub water (boiling first) and then adding 1/2 teaspoon of salt to the water. You can use it once it gets colder (but it’s better that it still warm).

Then apply the salt water on your nostrils with a nasal cleansing pot or a medical syringe (without needle). Aim the stream of the solution toward the back of your nose not the top, then you can blow carefully your nose. You can repeat this process twice a day.

If you don’t feel better doing this, you should ask for a medical appointment in order to stablish other causes.

I hope this information is useful