Allergy Season in Winter?

Ok, so my allergies are acting up. They usually never act up in winter, but this year is different. Now I am on the search for allergy relief. I do take an allergy medicine, but it's just not working as well as it use to. I wonder if I've become immune to it. I may have to call my doctor to see if there is any new medicines out because I am really tired of having allergy problems!