Going back to this old job

Going back to my old job feels weird. It's been almost 2 years and I'm going through some major de ja vu, and it doesn't help that I'm still recovering from a head cold so it feels like it's intensifying the feeling. And not only that, but an old friend is working there too and it feels just as weird since it's been over 10 years since we had seen each other and hung out.