overwhelmed by school and anxiety

Recently my anxiety has been making it extremely difficult to do my school work. Every time I try to do it I get so stressed out I feel like I'm going to pass out. I do great work in class but homework makes me really really crazy and a lot of the time gives me panic attacks. My therapist and I don't really know what to do and my meds aren't helping. I don't know how to tell my teachers what's going on!