Perennial allergic rhinitis

[loopsaloo]

DD 13 is suffering with this horrendously. She normally takes fexofenadine 20 mg twice a day but it seems like it's stopped working the last few weeks. I've tried Benadryl 10 mg over the counter but it only gives a little relief. I have an air purifier in her room, hoovering mattress etc.
Any advice welcome please

I have this. I use a nasal spray from GP daily. I take antihistamine daily and I use a nasal wash when I feel it's all too much otherwise I use steam to inhale for 2 minutes a few times a day. And take a lot of pain killers. Damp dust all surfaces, Hoover everywhere as often as you can bear it, do you have any keys? Is she allergic to washing powder?

Not keys! PETS