Omnicef and drop of a hat

I don't think my last post went through...my 22 mo old was given omnicef for pneumonia 2 days ago - the very first night he woke up screaming like crazy, lasted off an on for an hour or so, maybe more. He is NOT a sleep terror toddler and never has had sleep problems. The next day he did the same thing when waking up from his nap, the screaming and crankiness lasted about 30-45 min. It is now 2am and he's been doing it off and on for an hour again. My husband is with him and I am reading every one else's posts with the same effects on their kids. I just went over the omnicef website with a fine tooth comb - NOTHING on this side effect - it's rediculous. This is found on the internet by too many people making these middle of the night posts - i'd probably recomend they put a little more money into research and figure out what in the world is going on and why so many people are having the same experience. I'll be calling my doctor in the morning! He has also been really crabby since starting it - he'll just scream and 'freak out' at the drop of a hat - kind of like terrible 2's X 10 - and he was not previously like that either.