I can't really give you any advice about LDN or what to do. You are in a very good forum with some very knowledgeable and helpful people. I am sorry to hear that you are suffering so much without much help from you Dr.
I take baby aspirin which helps a little with my fatigue; beyond steroids for a quick shock to the immune system (which doesn't always do anything) to settle it down I'm not sure what can be done quickly. There is a lot of information about natural ways of helping your body but some of those take a lot of time to work.
There is some information about beets and their ability to get oxygen into the brain (I believe this is what the study was referring to, but I do have some cognitive issues - short term memory so don't quote me on this). This is pretty easy to do and fairly quick acting to from my understanding. You drink beetroot juice - I have heard up to 8 oz a day. This increases energy and I think it probably helps in a lot of other ways.
http://www.webmd.com/brain/news/2010110 ... -for-brain
I hope things settle down for you and if you have A/C in your home put it to good use this summer.