He sounds like he might be either becoming more efficient or he may have the beginnings of a cold or a bug.

In any case, there's no harm in offering, don't stress if he doesn't take the bb and let him sleep once he's done. Have you tried carrying him around in a sling or carrier, to calm him?

I'd suggest calling the ABA helpline as well, 1800 mum 2 mum. Someone can probably go through it in more detail with you over the phone and ask all the right questions!