I was leaning over to give my wife a kiss before walking the dog. I felt a popping sensation (one pop) got light headed, felt like I had fluids in my chest. I paused for a bit, it went away. I continued on my walk, my pulse was going crazy, I got light headed again, turned around and starting walking back home. I briefly got pain in the back of my right shoulder and down my arm but that went away. I ve had similar experiences like this happen about 5-6 times over last 5 years. Previous times would also include, excessive sweating, and dizziness. The first time I went to the hospital thinking I was having a heart attack, doctor said something happened but he didn t think it was a heart attack. Maybe panic attack.