Hi Michelle and welcome. You have quite a story. I'm sorry for all that you have been through but I am sure that it has made you into a very strong person. You made a great choice in wanting to make a change. Here you will find people looking to do the same as you so take advantage of the support system.
Although you can't be active, you do have the opportunity to alter the way you eat and that, alone, can assist you in where you want to be. As much as you like coke, you could see changes in your weight by cutting it out of your diet. Have you tried iced tea or other beverages allowed with your health history? I love sweets, too, but I have cut down ALOT on my intake of sweets by only have some sweets and not as much as I did in the past. It's all about moderation. Have you thought about a diet to pursue yet? There are tons out there to suit anyone's needs. Depending on what you can and cannot eat, I'm sure there is one out there for you
Good luck and I look forward to getting to know you!