Unsure if I have costocondritis

For four years now on and off, I’ve had rib cage pain (usually the breastbone/ sternum area) where I get a tight and painful flare up. It’s strange but only comes on late at night, I get a really tight chest, my rib cage area will feel sore and hurt and if I move in the night when sleeping, I’ll be in agony if I lay on my side or lay a certain way- almost like when you pull something. From 2025- March 2026 I actually didn’t have a flare up. I was then extremely stressed and came down with shingles and two weeks later the rib cage pain returned. I decided to go to the doctors and they did a blood test and ECG and they said all was perfect and that it was most likely Costo and stress.

I am quite a health anxious and stressy person, but since then I’ve had a flare up every month. I’ve noticed that I sometimes get a flare up after flying on a plane, or during stressful periods. But it’s odd as it only ever usually comes on in the night and then usually disappears by the next day?