Palpitations 28w twins

So I have had palpitations before I even got pregnant, but now they are so bad I can’t barely handle it! My OB doesn’t seem to be worried but they are all day everyday and this bloody heat I don’t know is making it 10x worse. Today especially they are bad and I am worried if maybe I should be seen I am scared I am actually going to have a heart attack. I feel my blood pressure is through the roof