Oh man, I completely understand where you are coming from. I am on day 3.
Day 1: My in-laws made a surprise visit. My surgeon is allowing 2 Protein shakes and a light dinner consisting of 4 oz of lean protein, a cup of veggies and a cup of fruit. My in-laws insisted on taking us out to dinner (they're not aware of my surgery) and it was really hard to find something on the menu I could eat... but I managed. After dinner my MIL stopped and picked up a small cake to Celebrate my son's birthday that is this week. AHHH.... so I made myself busy and drank a hot tea to keep myself occupied while everyone chowed down. Day 2: everyone had danishes for Breakfast, and mcdonalds for lunch (birthday boy got to choose). I had hubby swing me through smoothie King and picked up a Gladiator to "eat" while they chowed down on their bigmacs and happy meals. LOL. I didn't realize how much it really bothered me not being able to eat what others were eating until this. Our family REALLY uses food to celebrate. I think I'm lucky that my in-laws are so obsessed with my children because they really didn't notice what I was/wasn't eating. Family gatherings with my family will prove to be a lot harder, I'm sure.
Oh, and what KILLED me was re-watching Lost with my husband last night. We always pop in a season to re-watch at night after the kids go to bed and we snack on random stuff. He naturally got out his normal snack stuff (keep in mind he is military and fit) and I of course couldn't tell him not to do that around me.. so I sat there and suffered/ate my chewable vitamens and pretended they were something awesome. haha.
Anyway, sorry to write the book but I agree that this is helping to break the mental habits we've created for ourselves. I didn't realize how much snacking at night was such a major part of our evening routine until I was forbid to do so.
Good luck! We can struggle together... haha.