I hope you're doing ok? I'm being sleeved on Monday and am, to put it mildly, shitting myself! Not in the literal sense, but I'm frightened as well as excited!
Optishit has been hideous but effective for me - in 2 weeks I've lost 7.5kg so I'd say you'll be fine. It is boring, but my dietician instructed me to have at least two cupfuls of steamed veggies each day (for fibre, I believe!) so sometimes I have stir fried them (no oil, just soy sauce!) or had them with vinegar... Or just had salad with vinegar.
I had a Stress Echo (EKG) before my surgeon visit which was unrelated, but showed a healthy heart with no issues, despite having palpitations and breathlessness on exercise - apparently *only* because I'm so overweight! Lol I have 70kg to lose, so I'd love to hear from you via the Sept Sleevers page in Sleevers Monthly!
Good luck! Xxx