I think we're also in the same boat. He has been a lot more cranky the last few days. Yesterday his cheeks were real rosy and his fingers were constantly in his mouth. He has been STTN for a few weeks, but last night was crying out every few hours. Thankfully, was able to put himself back to sleep each time.
As PP mentioned, our pedi also suggested that he could not take some ibuprofen, so we might try that too.