hi,
the best idea i have for you is doing the walk in/walk out. go through your routine and put him to bed as you normally do. then, tell him goodnight and walk out. if (when
) he cries, walk back in & calm him down in whatever way works best (pu/pd, pd only, a quick cuddle or whatever - just not feeding). when he's calm, leave again.
it sounds like with all the changes, a little bit of separation anxiety has set in. this will help him establish a little object permanance; doing similar activities during the day will help with that too.
HTH a little.