Its not for aesthetic reasons your doctor wants you to lose weight for the surgery. Its so you can heal faster and easier without extra poundage getting in the way of that. Its easier to move and therefor easier to heal.Any doctors number one priority would be that your recovery process is a success. If you doc actually said aloud that he wants you to lose because it just looks better than get a different doctor because that ones a quack. Doctors make people lose weight before all sorts of surgeries.. Even ones that dont effect a persons outside appearance.
I wonder if you are consuming a carb heavy diet. If so, switching to a low carb one will make it easier. Fats and protein satiate you much longer. Once eating low carb feels easy, start by eating 2-3 times a day with no snacks between meals. When that feels easy, you can start skipping a meal and trying some intermittent fasting.
I am sorry your surgeon is delaying for aesthetic reasons! That is awful.
If you are feeling sick from 4 hours of not eating, it could be related to what you are eating in between fasts. If you are eating a lot simple carbs and spiking your blood sugar, it will be harder to fast. The Glucose Goddess instagram is really helpful on tips for reducing spikes.
When I first got into fasting I had a lot of random health issues going on and it was hard for me. I started by delaying breakfast for 30 minutes and then sticking with that time until it was easy before adding on another 30 minutes. Once I was able to do 16:8 without an issue, it was easy to push to 20:4, and then eventually longer fasts.
Around the same time I started fasting, I also increased my salt intake to help with one of my health issues. Making sure I had enough salt on the days I was eating was helpful for fasting as well I think.
If you continue to feel sick after 4 hours without food, you might want to get another opinion and see if there are other possible causes.
I’d look at incremental changes. Take a look at how many hours per day you spend eating - for many people eat for 15 hours per day. Even whittling that down to 10 hours is a big improvement.
How calorie dense are the foods you eat, on a scale from broccoli to cake? One of the ways your body decides it’s full is simply by how full your stomach physically feels. Big calorie difference between filling it with lettuce vs cheesecake, for an extreme example. But don’t be afraid of calories - your body needs them. Simply eating things that look recognizably agricultural- meat, veggies, nuts, etc. is a good rule of thumb. Shop around the perimeter of the grocery store.
Don’t drink calories - not even milk or OJ. It sneaks calories into your body without making you feel full.
I had similar problems - the inability to go long periods of time without eating - and it came down to having a diet too high in carbs. I’m not a doctor, but how I got through it was I cut out almost all carbs from my diet leading into a 72 hour fast to fully break the carb addiction. From there, losing weight has actually been pretty easy, and I’m not someone who is, you know, significantly overweight or anything. I’m actually a bulky athletic person looking to get lean.