Any type of irritation or inflammation in the nose can lead to a decrease in the drainage of the sinuses or a sensation of increased pressure within them. In addition, these same processes can effect the back of the nose, where the eusacian tube opens. This tube regulates pressure in the middle ear. If there is dysfunction in the mechanism of this tube (eustacian tube dysfunction), the ears can feel plugged and congested. It is possible to get tinnitus with eustactian tube dysfunction. Trying to decrease the inflammation within the nose is helpful. Understanding the cause (anything from an upper respiratory infection, sinus infection, reflux, allergies, nasal mass, etc) makes treatment more targeted. With some of these causes, using nasal sprays (saline, steroid, decongestant) with oral decongestants can be helpful--but only if you have evaluated the cause and are sure these items are an adequate treatment. If you have had continued problems, you should see a physician. Good luck.
One other thing...different medications require a prescription or a review of your current medications and medical problems to make sure that there are no interactions or contraindications.