Hi Rehabgal,
Welcome to the Mattress Forum! 
Iâm sorry to hear about your illness. 
While of course I wouldnât have been part of your conversations, I would find it curious that youâve contacted every single site member and theyâve all refused to recommend a mattress to you, unless your specific requests have been unrealistic or youâve asked for combinations of materials that are unavailable.
If youâre looking for all-latex mattresses that are under 10" in thickness, that is widely available, both from site members here and elsewhere online. Some even offer component-style systems where you can customize the comfort on one side versus the other. The one issue you might run into here would be the edge reinforcement system, as in an all-latex system there will generally not be a polyfoam âracetrackâ edge encasement around the perimeter of the product. Thinner and firmer all-latex mattresses, commonly using Dunlop latex, will tend to feel a bit more substantial along the edge, but again generally will not contain a specific edge reinforcement system.
Most foam mattresses (including latex) donât have or even really need side support if they have a support core that is firm enough and the comfort layers arenât too thick and/or soft for the person sleeping on it, but your needs may be specific and different. There is more information about edge support with latex mattresses (or other foam mattresses) in post #3 here and in post #33 here but with a latex or latex hybrid mattress (one that uses a polyfoam core or a pocketed spring support unit with latex on top) that is a suitable firmness level relative to the person sleeping on it then it normally wouldnât be a significant issue for most people unless you often sleep or sit with most of your weight concentrated on the very outside edge of the mattress although the outside edges of a foam mattress would generally be softer than an innerspring mattress that has a specific edge support system.
The only way to know for certain whether the edges of a specific latex or other foam mattresses will be suitable for your specific body type and sleeping style or your preferences will be based on testing the mattress in person (or a mattress that is fairly similar) before a purchase or by actually sleeping on it (if you canât test it in person before a purchase) and if you are uncertain whether you are one of the few that may âneedâ firmer edge support then a good return/exchange policy may be a more important part of your personal value equation just in case you are one of the few (generally in higher weight ranges) that needs or prefers a firmer edge.
Iâm sorry, but I donât know of any latex mattresses off the top of my head that have added edge support although there maybe a few that Iâm not aware of or that donât immediately come to mind.
If you have more specific details youâre looking for, Iâll do my best to be assistive.
Phoenix