We had this problem when we came back from our holiday in Feb as well as I was sharing a bed with DS on our month long trip. He was so used to having me sleep with him that the first few weeks were nightmare at BT. He was sleeping in a travel cot before we went on our holiday, and when we came back I sort of gave him the option of cot or BBB depending on where he wanted to sleep. The travel cot worked for us because he couldn't quite climb out of it as it had mesh sites. Maybe you can try that if you have one at home? I still did GW regardless of whether he was in BBB or cot though.
It's been a long process though and luckily DH was not working so he was helping with this as well. We managed to go from having to sit by his bed to gradually just having to stand by the door. And now we've found a compromise. He seems to like having a bit of light on, and doesn't like his room door shut at all. So we've placed a gate on his doorway, and will leave the door open at BT with the hall light on, plus a nightlight in his room. At BT now, he still sometimes asks for me to stand by the door, but for most part, he will just lay down in his BBB and go to sleep within 15 minutes. He has stopped climbing out of his BBB once I try to leave now. When he does ask for me to stand by the door, I generally do that for only about 30 seconds, and will keep repeating the sleepy phrase "go to sleep" if he still calls out. As long as he can still hear me calling back, he is generally ok.
I also have to mention that we did have to cut his nap down to 1 hour when this whole nonsense started, and that has helped a lot with his BT antics. He still generally has NWs though, which dont' last long. It's usually just him wanting reassurance that we are there. So we are sometimes able to just stand by the door and tell him to go back to bed. Or even if we have to help him back, we then just do WI/WO, and usually only have to do it once now. It truly, truly was hard work though and I still believe it is a developmental stage as a lot of 2 yos seem to go through the same thing. I guess it's just a matter of finding the best way to help him deal with whatever he's going through now without making you a prop. Hope that helps..
