S.B.
We have been having the same issue with my 18 mo old son. He use to sleep fine in his crib until he learned how to climb out. Now he sleeps in a bed. He began waking up several times a night at around 15 months and this has gone on for about 3 months. Turned out, he was getting about 7 teeth in all at once. Now, he is doing much better. The two things that helped him were motrin and hylands teething tablets. Still, we had to ride it out and now for the last 3 nights he has slept all night! Hopefully this is the light at the end of the tunnel. I would try motrin and the hylands and then see if sleeping in bed with you for a while until this passes. Of course, you may have an issue with getting him back in his crib after that. Also, you can buy a crib tent to keep him in his crib. I wanted to get one, but my husband was against it so we have just decided to put him into a bed earlier than we had planned on. Good luck and hang in there. It will pass soon.
S.