I've personally tried homeopathy and different supplements and nothing but Allegra-D works to help control my allergies. My PCP didn't want me to take it very much, but when I tried to cut down on it, I almost got a sinus infection and I was so congested that I couldn't breath through my nostrils at all and the pain from it was bad. I have been taking allergy medications daily for over ten years to help control my severe allergies.

Sudafed might not be good for a head injury (I'm not sure), but in my opinion, severe allergies are worse.

It's definitely worth trying other meds as camyman suggested; just because they didn't work for me doesn't mean they won't work for you. I gave them a shot and was disappointed when they didn't work. C'est la vie.