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An exercise program would make you feel much better I am sure. But with the problems you mentioned you really need a good medical check up before beginning a diet and exercise program. Walking is a good start up exercise, but again, I can't stress enough the importance of making sure that all is well and you get the go ahead from a medical professional to start your diet and exercise journey.
As a former heavy person myself, I can tell you exercise is so important to me now and the most I could do 12 years ago was work and eat. Now at a healthy weight I am very active. So it is achievable. Just get medically cleared first. Diets and exercise plans that promise fast easy results can be dangerous and don't usually work. It has to become a lifestyle change. And your doctor should be the one to put you on the right path.
Good luck to you and keep us posted.
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I agree that you need medical attention for all your issues .. weight, BP, depression, etc.