[sedocmiv]

Some others have already mentioned some of these things. My approach is one of both mind and body.

Mind: 1. Do a 10-day Vipassana[1] to jump into meditation (this could take some time as they usually have a wait list). My belief is everything starts with the mind. This will help establish a foundational meditation practice (which in time will become your ultimate weapon against stress). Not to say one can ever be stress-free, but more along the lines that you will have tools to deal with it in a healthy manner. 2. See a therapist so that you can talk to someone about the struggles you have (using BetterHelp you could start this today). I don't think anyone is immune from stress. Stressors (like work, relationships, money, kids etc) can (for some people) show up as weight on the body as a defense mechanism. Talking to someone regularly may help with this.

Body: 1. Hire a sport nutrition person to come up with meals that work for you that take any food allergies into account. Sounds like you already found something that works for you. 2. Do blood work regularly (every 3 months) to track various health markers. 2. Hire someone to cook the meals from the nutritionist 3. Hire a personal trainer that can help keep you getting to the gym. The personal trainer can help come up with a program that will help you achieve your goals.

Consistency is more important that how much weight you can lift or how far you can walk.

[1] https://www.dhamma.org/en-US/index