If you have sore throat and aching ears and such, I would think that is not an allergy but rather a cold or other infection. I wouldn't be taking allergy medication for that, especially any strong ones. It could make you feel worse, and won't help with getting you better if it's not just allergies.

Try switching to just something that will dry up your nose a bit while you get through this cold. If you get worse like infected sinuses, go to the doctor. If it just is hanging on as a long cold without getting worse, get lots of SLEEP and drink hot tea and juices and gargle with salt water.