Hello I started to suffer with this at the start of the year. I felt a massive thud in my chest and thought I was going to faint this happened a few times so I went to my dr. She said they are harmless you have them many times a day but when you are anxious you notice them more. You feel light headed because your blood pressure drops for a split second. After this they went and I didn’t have any for months.
They feel horrible I’m very anxious at the moment and have noticed them quite a lot the last few days but I’m trying to ignore them. Hope you start to feel better soon