Oh snowy
No one wants to see their baby upset

Will he take a dummy? or maybe you could give him EBM for comfort??
Im sure he will be fine. When you went to work last month, from what you said he was ok.
If he is really upset, you can always go on lunch early to go back for a quick cuddle. Or perhaps get your dad to drop in for a cuddle??

If he's anything like Theo, when you're in his vision - he is going to want his mummy. If you're not around... outta site outta mind iykwim.

I hope everything goes alright.
Try and enjoy your days back at work