I'm almost four months post op and I still have two shakes per day in the form of proffees. I can't afford to stop them. I hit higher protein goals because I do cardio/strength training five days per week and I couldn't eat that much protein from solid foods. As for vitamins, I will never stop taking them. My surgeon stressed how important it was to prevent vitamin and mineral deficiencies by staying on top of my supplements, (and having regular blood tests) because once they occur it's much harder to bring the levels back up, so it's just not worth going against that medical advice. I trusted my surgeon enough to operate on my body, so surely I'm going to trust her advice on preventing V&D deficiencies so I will follow her advice forever.
To the OP: I would say that life is probably easier for you post op in many ways after losing weight, the trade off is your guts have been rerouted, and you can't compromise on supplements and protein. Have you had your vitamin and minerals checked via blood test? Talk to your team and see if they approve these changes, take their advice firstly because they know your medical needs.
Best wishes!