Hey Lisa,
Only a blind man couldn't see you haven't lost weight! Love the pics btw, imho you look lovely in ALL your pics.
Can I ask, did you tell your work colleagues you were going for surgery? ...because a few things strike me here...
a) They don't know how to approach you to talk about the surgery and your weight loss so far (a bit like when someone dies...no-one knows what to say to you, so often they don't say anything at all for fear or upsetting you or making you uncomfortable)
b) I don't know your relationship with your work colleagues so I may be way off the mark...but have they always known you as the pretty, fat girl? It could be the person they saw you as made them feel 'better' about themselves, so seeing obviously successful weight loss post surgery may make them feel uncomfortable/envious?
c) As others posters have suggested, it could be when people see you every day, they simply don't notice for a while....in a month or 3 someone will 'see' you one day and suddenly exclaim: 'OMG, you've lost loads of weight...!!!'
It is an interesting situation though....have other posters found themselves subject to negative/oblivious situations like this?
Anyway, do not feel rubbish about your successful acheivement so far...good luck in your journey!