 [ Symptoms ] how rapidly can you lose weight and still be considered healthy [ Disease ] in my opinion if pain increase with sitting and sleeping reliefed by standing then indeed it is costochondritis if not then i recommend you check the side effects of your contraception pills another possibility is thoracic disc space reduction usually happen if you have no kyphotic curve or if you do much running or jumping in which case you will need a thoracic x ray to confirmgood luck