HI, I have had Rather uncomfortable feeling in my chest for a while. I went to my GP a while back and she told me it was anxiety but I doesn't feel like it. My chest feels very heavy and tight like I have something constantly leaning on it. My breathing is also slightly uneven, I find it hard to breath at times almost as if I have to force it. I also have stitch like pains in my chest, it is worse when I am lying down. I can feel my heart beating irregularly. I am getting worried about it as it's become increasingly uncomfortable.