I think i fractured my rib that connects to my sternum?

i sneezed wrong and felt a pop in my chest then i had to felx my chest out jus to beathe witout pain evetually it stopped but i still had pains wit bending or using my chest (pickin up stuff) coughing yawning.... when i got it checked out the doctor put his hand on my chest and when he pushed on it it releaved some pain and helped wit my breathing.... i was toldt it was a small fracture... so it healed well i thought.... and 1 night i went to sleep perfectly fine and when i woke up in the mornin i had the same pain in my chest but jus a little bit higher and i had to flex my chest out again and evetually find a position to lay in that didnt hurt me and when i went to push on my chest cuz i thought it was the same thing as lasttime it hurt and i felt in the middle of my chest i had a bump and this bump, it hurt to be touched and touched around it....... it feels like it might be my bone or somthin.. i cant relax my body cuz of this pain my body constantly hurt cuz of the positions i have to sit in it feels like my body only gets relief is when i lay down... what did i do...???