Sherrie, I'm going to suggest something that's going to seem WAY out there. For some of us it works wonders, for others it's not so good. From what I've read so far, it will help you out. Those it's bad for are those who are diabetics on insulin or those on oral diabetes medications. For those folks, it requires frequent blood sugar checks so the meds can be adjusted down and eventually stopped as needed so you don't end up too low.
Diet: 10 calories/lb. 60% fat. 35% protein. 5% carbs that come from only green veggies. Things like broccoli, spinach, asparagus,
brussels sprouts, cabbage, lettuce (with full fat, sugar free dressing). Your meats will be whatever you want. Preferably beef and pork - don't go for the lowfat stuff.
Workout: Keep walking.
When you feel up to it, then add some body weight work like pushups, crunches, body weight squats, body weight lunges, and when you are able - burpees.
If you find you aren't losing 1-2 lbs each week. Drop 100 calories/day each week until you are. If after the first two weeks you are losing more than 2lbs/week, add 100 cals/day each week until you slow down to that much.
It's pretty easy to do. Just eat meats, eggs, cheese, green veggies each time you are hungry. Eat until satisfied, not stuffed. Don't go more than 4-6 waking hours without eating even if not hungry, have a small snack like a deviled egg or something.
I was once 300lbs and this is how I lost my excess body fat. Now if I can just figure out how to add some more lean tissue, I'll have it made.
Good luck, you can do this even without a gym or complicated fitness routine. As you progress, the exercise can progress too. The diet will change too, but we will cross that bridge when we get there. Let's get you down to a
healthy weight for your height first.