S.F.
So sorry about your troubles. It will get better. My 4 year old son did the same thing at about 4 months. I associated it with his learning to turn himself over, he was waking himself up and didn't know how to self-soothe and put himself back to sleep. I introduced a "lovey" at this point, since the risk of SIDS decreased so much that he can roll over. I used a diaper cloth that I held under my breast while nursing. It smelled like me, smelled a little like milk and he took to it like a champ. It took a few nights, but he was able to put himself back to sleep. The lovey came in handy as he got older too. It helped comfort him when he got hurt and when he started nursery school. It now stays home, but he still sleeps with it. Hope this helps. If I can offer any more suggestions please let me know. Hang in there.