Hi J.,
If it is teething, Hylands teething tablets are the best!! They are homeopathic and they melt in their mouths!! I gave this to my son all the time, he knew eventually what it was!!
Magic pills!!
They work wonders. Give him about 2 at one time, every 30 minutes and then go up on them. They will not hurt him, they will make him sleepy.
They worked for my kid! They are at Wal-Mart (vitamin aisle) and also at Kroger. I bought 5 bottles so that I could have them with me all the time! 1 in the diaper bag, 1 in the car, 1 in my husband's car, one upstairs, 1 downstairs! Girl, I had people calling me for some, so they do work.
He hated orajel and that stuff from Central Market was to expensive and didn't really work, so I just stuck with the Teething tablets!
If he is continuing to run a low-grade fever, this might be something else. My son would be lethargic, run low-grade temp and have no appetite when he had an ear infection, so you might want to get that checked out too.
Good Luck!
G. B.