I can't take this anymore!

You should be able to be know what your allergens are. You may need to change your pillows or curtains weekly... sometimes, it can even be seasonal.. if that is the case, then you cant do anything about it.

I have allergic rhinitis also, and I know how very uncomfortable it feels when it acts up. I also take antihistamine tablets. You could probably minimize the occurrence by making sure your room is free of dust or at least keep it from accumulating too much. If you're using a fan when you sleep, have it always oscillating and not in a steady position direct to you. If you have pets, don't let them inside the house. And avoid putting strong cologne or perfume. Sometime strong scents and odors trigger the allergy also. Well, this is what I usually do. I hope some of them would help :)

There are good over the counter medications for this. Sudafed is what i use. I have these same allergies and they are a pain. The stuff I take doesn't cause me headaches,dry mouth and drowsiness. The allergies cause me horrible headaches that only a crystal will relieve.