It sounds very strange to me also that your MCHN recommended that.
My daughter started having some separation anxiety around 6 or 7 months, and it got a lot worse around 10 months. It has settled down a bit now (she's 13 months), but there's still no way I could leave her in a room on her own without her getting upset unless she was in a REALLY good mood.
It's frustrating when you want/need to get something done without them, but they don't know that, they just need comfort. Good luck!