Worried about my heart

Hey guys,

For the last couple of weeks I have been waking up with pressure on my chest. As if there has been some kind of heavy book lying on my chest all night. The last couple of days this feeling is sort of persisting throughout the day. It also feels like my heartbeat has been softer and slower. I am starting to get worried. A couple of days ago I had a very sudden moment where I was very light-headed as if I was about to faint and I had to lie down a bit to regain my normal state.

Does anyone else recognize these symptoms?