In the last six months i have had lots of symptoms and testing.It all started with a racing heart rate up to 150 at times, Chest pressure, and feeling like I could not breath. I still have a lot of cheat pressure that is there more then not through out the day. I also get shooting pains in my chest mostly on the left side. I have had multiple EKG's, 2 echos, tilt table test,and I was on a heart monitor for a month, I have been tested for lymes, acid reflux, tyroid problems and have had all negative results. All the doctors have not been able to find anything other than a hiatal herni, my doctor says though that, that would not cause any symptoms. Recently I have been getting this weird pulsing feeling at the top of my stomach I am guessing where the diaphragm is. I dont feel it in my chest and my heart does not race when it happens, could this be heart palpitations or is it something else? Have I had adequate testing to rule out anything with my heart since I still have the pressure? I am a 27 year old female, not very active other than taking care of three children. My youngest is 9 months old, for the first 6 weeks of pregnancy I was very sick. Could that have played a role in all of this?