After receiving the vaccine there was an evening that when I laid down for bed I started experiencing what felt like my heart was pounding. I went on to falling asleep and the next day I woke up fine. It wasn?t until Wednesday early morning that I noticed the tightness feeling in my chest, my heart feeling like it was racing, and the feeling I had to continue to take deep breaths. I continued through my day getting my girls ready for school and taking them to the bus stop. I continued feeling this way throughout the day. I begun monitoring my heart rate with my Apple Watch and my heart rate was anywhere between 100-147 bpm when I was standing or walking. When I finished my errands I returned home to rest on the couch hoping these feelings would pass. When I was laying down my heart rate was between 77-85 bpm. After getting my kids off of the school bus is when I decided to call my doctors office. I went into detail on what I was experiencing, what my heart rate was periodically, and that I have had the first dose of the Pfizer vaccine on the evening of 18th. The lady I spoke with was going to send the information off to my dr to see what she recommended. Not even 10 minutes later I received a call from the nurse practitioner from my doctor?s office asking me more questions about the type of vaccine and which one. The nurse then said my Doctor recommended that if my heart rate was 110 bpm or more that I need to go to the ER. I decided to take it easy for the rest of the evening and go to bed, I decided that if I continued to have these symptoms in the morning that then I would go to the immediate care. Thursday morning I woke up still with the symptoms. So I got my kids ready for school and went to the immediate care once they opened. When I went into immediate care they took me right back when they seen what my Watch was showing my heart rate was. I was then given an ekg which came back fine but with my heart rate being 124bpm while I was sitting with the dr she did not feel comfortable allowing me to leave unless someone picked me up and took me to the ER, and even offered to call an ambulance to take me over. I then called my husband who was at work to come get me and take me to the ER. Upon arrival at 10:37am they registered me in and took me back to take another ekg and to draw blood. I told them that when I?m laying down my heart rate is normal but once I stand and start walking it will jump 110 bpm and beyond. The highest it got yesterday was 158 bpm. They did a chest X-ray which came back normal and the ekg came back normal. After being in the ER for 11 hours I finally was taken back to see the On-call dr. He said that the ekg and X-ray looked great but because of the tightness in my chest and the high heart rate that he wanted to do more blood work to make sure I?m not clotting. After the bloodwork came back fine he discharged me but had an outpatient order for me to wear a holter monitor for 72 hours. After being at the ER for 12 1/2 hours I was finally discharged and on my way home. This morning I have called to set up an appointment for me to go back to Hospital to get the holter monitor which will be on September 7th. And today I continue with the same symptoms.