I went through similar journey of starting out planning on lap band a couple of years ago, changing my mind, trying diet and exercise again for a year (unsuccessfully) not wanting to do bypass (for same reasons you stated) then deciding on sleeve. I do not have all of your health concerns other than a very lumpy bumpy thyroid with very little function, but so far it does not have to be removed. I did have several scares with chest pain (one that scared me enough to go to the emergency room) that turned out to be nothing, but it was enough to remind me that I want to live to see my children graduate college, get married, have grandchildren, travel etc....but if I kept on my current course, I was surely decreasing my chances of making it that far. Then my friend, who had the RNY operation four years ago, ran the NY Marathon. She looked great, she felt great and now she had accomplished something as incredible as that! Where was I, I was at my highest weight ever, 272 lbs feeling fat, tired, uncomfortable, embarrassed and miserable. I decided enough was enough and I got started on the journey to have the sleeve. It took 8 months of meetings with NUT, getting all the required work done etc, required by my insurance company. I had many moments of second thoughts, especially when I had to go for tests and things I would have otherwise never done in a million years. When my surgery was finally set, I almost cancelled about 100 times, I was so scared. BUT I went through with it on June 4th and I can honestly say it was the best thing I ever did! There were a few times in the hospital and during my first week home that I questioned what in the heck did I do to myself, but now I am getting used to the plan and I am down over 40 pounds since surgery and have never felt better!
My point in telling you all of this is that it is human nature to cling to our old way of life because we are scared and it is what we know. It is really scary and hard to face the unknown of how things will be after surgery (and for me I had NEVER had surgery of any kind, so I was also really scared of the unknown of what that would be like). The tests and all the visits are a pain, but need to be soldiered through with your eye on the end goal...YOUR HEALTH! In the end, this surgery has helped so many people improve their health and their lives in unbelievable ways. I just read a post of someone who after 9 months is down 90 lbs and off of her 12 meds! With all of your health issues, imagine what life would be like for you if losing weight nullified or at least alleviated most of them! It is normal to be scared and uncertain, but in the end, don't let that get in the way of taking control of your life and your health. YOU ARE WORTH IT! Good luck to you. My prayers are with you that you can find peace and calm going through this process and that you have a safe and successful surgery.