I have had a cold for 12 days. For the past 3 days, I have had one ear that is alternating between being blocked and unblocked, without any pain or fever.

Yes, it is recommended to continue using Sinus Rinse as often as needed throughout the day and at least 30 minutes before bedtime. You can also try using a nasal decongestant spray like Drixoral or Dristan to help with the situation. Make sure to follow the instructions on the product and consult a doctor if the symptoms persist for more than 7 days without improvement.