When I try to go to sleep I start feeling like I can't get enough oxygen. Doctors told me it was just my anxiety and upped my dose of Effexor. Its only gotten worse. My throat and chest feel tight and I have a constant urge to swallow or cough. When/if I doze of I jolt up in bed gasping for air. Please help me, I'm losing a lot of sleep and its really freaking me out, bad. Thank you!!