You'll be fine, you've been away a long time and your collegues are expecting you to just slot straight back in. Do things your own way, ignore the looks, and just get down to settling back in.
As for swapping personas you are a working Mum, you don't need to change, you just focus differently. Is there any scope to ring to check in on your ds to settle your mind a little?
things will find their own way, good luck, we're thinking of you and we're here if you need to vent.