About four days ago, in the midst of the night, I felt an intense pain coming from my two shoulders alike. It was unbearable and I don't know what I would have done without the good dose of aspirin I took - even then the pain was still intense. After a three hours or so, the pain in one shoulder started dissipating and an hour later still the pain was gone altogether. Now, the pain was apparently at the bone level and it was the second time I feel something like it, with the first time being more bearable. Any idea of what it could be? I've been sleeping with AC on allot lately, I suspect that there's a relation.