Hello, I ve been suffering from dizziness (all day), constricted pupils, nausea, heart palpitations, & shortness of breath. Recently I had some kind of event that I can scarcely described. It felt like my heart was fibrillating for about ten seconds & I almost lost consciousness. Could this be stress & anxiety? Or something more serious I should get checked out? I have a history of depression, anxiety, & mental illness in my family. Thank you for your help.