Sounds like palpatations (spelling??)...I get them aswell, and my symptoms are just as yours...I can be walking and then all the sudden I get a horrible stabbing pain
, and my heart beats VERY hard and irregular, lasts a little while and then gone!! They are very painful...You need to tell your doctor this is what you think it is it is said like this Pal--Pah--ta--tions...that is how it sounds
My doctor actualy gave me a heart monitor I had to wear for a while so he could get a recording of the action. They wont diagnose it till they see it...This is really what I think you are suffering from...Ive been diagnosed with it, and your prob sounds just like mine!