I'm no expert, but reading your post, the first thought that came to mind was "diet break" , which is something advocated by Lyle McDonald, of "Rapid Fat Loss" fame (one of his books). Lyle advocates "cheat meals" for those who still have a lot of weight to lose - and these are recommended purely for psychological reasons.
However,
for those who are fairly close to goal (you), and/or have less weight to lose - he prescribes a "full diet break" every 6-8 weeks or so, in order to "reset" metabolism. In addition to diet breaks, Lyle suggests something called "re-feeds" where a person eats more food and carbs than usual once or twice per week - and both of these techniques are geared to re-setting metabolism.
Since you've been doing some fairly extreme dieting in order to get where you are now, it makes sense to me that perhaps you need to take a break for a little while before trying something else. This isn't to say that you're going on a binge-o-rama or some kind of carb-fest, but that you'll simply take a break from the dieting and eat reasonably healthy for a week or so.
This may set the stage so to speak, for you to be able to actually try something new and have it
work. Right now, because you've been eating so very, very low-carb and probably low-calorie for awhile now, your body is just staying put. If you were to take a week "off" all this stuff, perhaps you'd be able to sort of "re-set" the thermostat or what have you.
You can offset the gains slightly from this "diet break" by increasing your level of exercise. You may gain a few pounds, but I think it might be important for you to hit the "re-set" button before trying something else.
You've already done fat fast, meat & eggs - and there isn't really anywhere else for you to go with this. There aren't any carbs to cut, and your calorie intake is probably already fairly low.
So you're kind of stuck.
Since you can't "lower" any more (whether that's carbs or calories), I'd suggest that you do the opposite for a week or ten days or so - up the cals, up the carbs and up the exercise in order to compensate a wee bit. Once you've done that, you can perhaps try PSMF or what have you.
I'm NOT suggesting upping the cals and carbs by a huge amount, but up them by maybe 20% or so in order to try and "re-set" your metabolism a bit.
I'd highly recommend going to bodyrecomposition dot com and looking into purchasing the "Rapid Fat Loss Handbook" there. This book is excellent and very informative when it comes to how to ensure one's metabolism continues to work well, despite crash/extreme dieting. There's a full explanation as to how "diet breaks" and "re-feeds" work in order to re-set things.
Good luck with being able to get past this.
Sara