Hi Wanj, and thanks for your post. I am hopeful others in the community will see your inquiry and chime in by sharing their own personal experiences with nasal congestion.
In the meanwhile, we do have any number of articles published, right here on our COPD.net community website, which focus on just this concern. For your convenience, here is a link to several of the articles for you to review at your leisure: https://copd.net/search?s=rhinitis%20runny%20nose. I do hope you find the information is helpful in a practical way.
Wishing you well,
Leon (site moderator COPD.net)