Ok, well that rules out tendinitis for the most part.
My guess would be something with your supraspinatus tendon (Though typically, if there is a strain, you would find weakness and pain when you applied resistance while abducting your arm.) or your bursa sac in your shoulder (subacromial bursitis).
What you are describing sounds a lot more like subacromial bursitis, however that typically doesn't occur alone...usually it happens with inflammation of your supraspinatus tendon.
My recommendation would be to ice it in the evenings, 15 minutes on, 45 minutes off to help with pain. You don't want to ice it too much as there is already limited blood flow to tendons and ligaments, and blood flow is what heals injuries. Take pain medications (avoid Tylenol!) such as advil or Motrin. You want IBprofin types, not acetimeniphen (I can't spell at all). And try to avoid use for a couple of days. Don't sleep on that side if possible.
If the pain hasn't disappeared in a couple days...see a doctor.
Again, its hard to diagnose without seeing the shoulder and performing certain tests, but thats my recommendation. You can ask me any other questions if you want either here or via PM
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