That's already a huge accomplishment!
And yeah...that diet is so frustrating sometimes... I have roommates that will come home with delicious looking carbs while I'm sipping a meal replacement. I'm doing the same after having a very large hiatal hernia repair and gastric bypass for my severe GERD. Also did the same as you were going to with the feeding of the snakes prior to sx. The small dogs who were used to me picking them up were very confused by the sudden rejection. ;_;
It starts getting easier the longer you stick with it! And it's totally worth it in the end. I hope that you can get to your goals and safely get through the rest!