I felt okay this morning maybe a little anxious, I was sitting down and when I stood up my ear started to what felt like pop over and over again very quickly, as this was happening I started to feel lightheaded and it felt like my heart wasn’t there since I checked my pulse very quickly thinking I’m dying. I didn’t feel anything and then my heart started to race really fast and I got super shaky. It supposed after about a minute. Has anyone else had anything similar??