Hi bobbiebt5,
The first place I would start is post #1 here which has the basic information, steps, and guidelines you will need to make the best possible choices.
With medical or weight issues (or for that matter anything that makes each person unique in their needs and preferences) … it would become more important to connect with more knowledgeable retailers or manufacturers that can give you some good guidance and feedback and to make sure you do some careful and more objective testing for PPP (Pressure relief, Posture and alignment, and Personal preferences) on mattresses because you may be outside the “averages” of what may be suitable for others that may otherwise seem similar to you.
Phoenix