Hi, thanks for writing to HCM.
Based on the description of symptoms, I suspect that you could be suffering from Costochondritis
. This condition can get aggravated by any activity that involves stressing the structures of the front of the chest (as sleeping in prone position).
Rest, anti-inflammatory drugs, physical therapy
are the therapeutic options. Local application of Ice packs once in 2 hours will alleviate the pain.
Hope this information is helpful. Good day