Sleepless Nights

Any hope of sleep we once had has seemed to have gone down the drain.

I thought it was the teething, but his teeth have popped through...how long are they in pain with the teeth for?

We let him cry it out to go to sleep, which usually doesn't take long anymore, but he sleeps at most two hours before waking up again...usually more like 45 minutes to an hour....all night long. 

I don't want to be a bad mom and leave him if he's in pain with the teeth, but I've also read around 5-6 months their sleep pattern changes and they'll continue to wake up more often until you sleep train them otherwise.

I'm not sure what to do.  I'm hoping our visit to the pediatrician Thursday helps with some answers.