hiya

Ive had fairly similar, though i dont think as bad, for two kdifferent reasons

1) damaged tissue round my ribs on left side. i fell down stairs when i was 15 and ended up with scar tissue (on hte inside) round my lungs. now whenever i get a cough it will start really really hurting round my chest and referring pain down arm

2) mastalgia. basically its breast pain. people can have cyclical where its more on outer part of breast and due to period cycle. theres also pain unrelated to period which tends to be more under the breast and goes into upper arm. i have had this once and it was excruciating possibly caused by not wearing bra for a few days, can also be due to infection or muscle damage for instance you may have just banged into side of door as you went through, it wouldnt have to be that hard and you might just have forgotten.

anyway, those are my expereinces that might be relevant. the breast thing isnt dangerous, just painful

our bodies are such intricate thigns arent they