Peanut ball helps me a lot, but what should I do now?

I’m from Brazil, sorry for my english that is not so good.

I have tietze for 2 years and I have a swelling in the top of my chest, I can’t see, but I can feel if I touch, I just felt the swelling 3-4 weeks ago (maybe because I stop the gym at 29/06 and my chest is not strong any more ;-;).

I started to use the peanut ball 6 days ago and the swelling improve, I feel that is smaller now.

The pain is so much better, I don't fell the pain when I breath, I just feel a little discomfort when I lie down and sometimes when I sneeze.

I need to get back to the gym and running as soon as I can.

Do you think that I need to wait the swelling disappear 100% to get back to the gym and running? Or with this improvement of the pain I can go back again to the gym and running?

Should I start another exercise or another thing to get better?