Hi, am so fed up here tonight .Am taking a few antihistamines daily as prescribed by my doctor for hayfever / allergies.For the past week I am going mad from bouts of sneezing leading to a blocked up itchy nose.I thought my antihistamines would solve all this but I am now wondering are they causing this sinus/ blocked up head feeling with slight pain around nose.Oh I am fed up of allergies.... Sorry for moaning but should I run for a decongestant I wonder on top of antihistamines ?? Thanks x