Guess what people take for allergies - drugs that actually prevent reactions. Allergic reactions that effect the nose are almost always going to result in discharge, aka. a runny nose. It's the body's natural way of removing the allergen. Pseudoephedrine doesn't help with this at all.

The side affects of prolonged pseudoephedrine use (usually defined as more than 7 days, btw) are far more serious than a stuffy nose.

You cannot even purchase enough pseudoephedrine to use every day over a full month. The government restricts maximum grammage per month - and no doctor is going to prescribe long-term use of pseudoephedrine to "help with allergies".

That is to say I don't believe your story at all. But I get it - googling these things before you posted would have "cost" you approximately $24 or something something something...