Don't laugh too loudly

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Three day ago,we had a party.We all laughed to tears at someone's funny story and foolish acts.But I felt little ache in my left side rib.I don't konw why.The ache went worse,especially I went to bed.I thought maybe it was costalgia.Last night,I nearly can't bear the pain.Today I go to hospital.The doctor give me some pills.they are antibiotic and vitimins.But she isn't sure if I have some inflammation.I feel puzzled.Tomorrow I will go to hospital again,but I am afriad doc will inject some drug into my body. who can give me some advince how can i do?