For the past 4-5 days i’ve started to have irregular heartbeats and the pulse was low during that time, around 40-50. For the past 2-3 days I feel a constant pressure on my left side of the chest and it goes away from time to time but it comes back. I also feel like I can’t get enough air, but I can breathe normally. I feel a lot of gas and have burped and flatulent a lot. I also have anxiety for the past 1 year and had a heart surgery at the age of 4.