I was admitted into hospital after suffering serious chest pains and struggling to breath and discovered I had double pneumonia. After further test I was told I had severe sepsis and empyema . I spent four weeks in hospital. I have been out of hospital for 2 months now and have been making slow but steady progress in getting my strength and stamina back . but today my chest feels tighter and I'm having to take long deep breaths to feel like I'm getting any sort of oxygen , I did go on a good bike ride the day before , so I was wondering if should go and get it checked out or could it have something to do with the bike ride .