We have chatted before on this very thread above.. and I can assure you that I had more benefit noted from my first FMT from my 48 year old wife with some occasional arthritis than from the young 25 year old athletic male I made friends with in the remote jungles I went hiking where there are no doctors and people rarely get sick .. (I am not making up this story.. it is real).. so my theory is that the first FMT give me the largest boost of gut bacteria I had been missing for years.. and hence the biggest jump in energy within an hour of this first FMT.. subsequent FMTs from healthier people might have helped me, but not noticeably. Overall, over the years, I have kept trying different things and I usually see an almost immediate relief or benefit when something works. If I don't see the relief, then that may not be the problem is how I look at it. For me, after the first FMT, the next big thing was urine therapy. Other things that have helped are taking super-B complex. B-12 weekly shots, which I have replaced with B-12 daily sublingual; staying away from gluten and sugar. So if something doesn't work for me, I go try something else. Have you tried FMT after making your diet alkaline (raw fruits/ veges and almost no meat?). tried vege juice? Veg juicing gives me a nice energy boost as well! CFS is a problem with many heads.. I don't get hung up on 1 solution.. I keep moving.. Good luck my friend.