It all depends on what the root cause is for YOU... for example, a lot of people improve by doing a heavy metal detox. However, that only works if the root cause of your symptoms is heavy metal poisoning.
For me going to a Naturopath has helped the most as far as "treatment". I am doing their "nutrition response testing" program. I have been going for 3 years and it has helped me tremendously with healing. They can see exactly what your body needs to heal. You have to take a diary of everything you eat and take prescribed supplements. What you take usually changes from month to month as your body heals one thing and moves on to another. If you are like most of us you have a lot of damage to get to the point of being EHS so it does take a lot of time to heal especially if you are in a filthy emf environment. You need a clean environment and good food/supplements.