Hi This May Sound Like I'm Going Mad , I

Hi this may sound like I'm going mad , I have a weird feeling of doom all over my body that lasts for hours my ankles feel like they have a lot of pressure in them but no swelling and my legs are cramping , I breath through my nose and lately it feels like something is blocking it which wakes me in the middle of the night and happens during the day also, my heart has also been racing