My 5 month old baby screaming?

When my daughters 5m. old did the same thing, we thought it was an ear infection,took him into the doc., he was fine, low and behold, a week later, we saw his first tooth!!!! I would take him from mommy and gently hum and walk him alot. It seemed to help . If you can find another person to aid you,it may be a good distraction because baby may relate the frustration to you.set them in their bouncer or swing and put on cartoons or a baby video,kids dont always have a scedule,so try a bath too.you may need to drink some coffee if you do,but it too will p, i promise you.