You should not use Sudafed unless you are pretty sure your ailment is caused by a deficiency of Sudafed. Anything you do use should be researched on the internet. Go to google.com and type the name of the potion followed by "side effects". Here is what you get:
SIDE EFFECTS: Nausea, vomiting, trouble sleeping, dizziness, headache, or nervousness may occur. If any of these effects persist or worsen, tell your doctor or pharmacist promptly. Stop taking this medication and tell your doctor promptly if you have dizziness, nervousness, or trouble sleeping.Sep 23, 2016
Common Side Effects of Sudafed (Pseudoephedrine) Drug Center ...
www.rxlist.com/sudafed-side-effects-drug-center.htm
Well, at least they don't include plugged nose. If you research pain killers, side effects include increased sensitivity to pain!
If you want natural treatments, a large dose of vitamin C often helps. You can get vitamin C crystals which have a strong taste, or sodium ascorbate which has a very mild taste. Vitamin A stimulates mucus, and your body probably needs all the mucus it can get. Mucus is what keeps the body clean.
When I have a stopped nose I put Vick's Vaporub on my feet and clean sox over it.