Costal cartilage swelling. The swelling!

I have a spindle shape semi hard swelling in costal cartilage area. Near costo sternal side. It was noticed 6 Months before . That month I did some strenuous activity. I don't know the swelling was there or not before but the pain starts after I noticed the swelling.initially the pain was tearing type upon weight lifting and small movement. But now the pain reduce a lot although the swelling doesn't gone. Upon resting no pain I feel. My blood reports CBC ESR CRP are all in normal range. Done ct scan 2times with 3D reconstruction and brest USG also as I felt breast pain some time. All reports shows all in normal range. Dr told it costrochondritis. Some times holding phone also feels pressure on chest. Just like I feel edema buildup in tissue. Should I do some more test or is it normal in costrochondritis.how to reduce the swelling