"Huh?" Kinda funny way you said it, but I got it, a bit scary hearing that. Don't think you need worry in that extreme, though, I've had ME thirty years, and same thing, dropped weight right from beginning. Our heights are similar and my best weight was always around 160, now just under 150 and doing best I can to hold on to that, It's a battle.
Don't know if applies to you, but some things helped me in past were: copper and zinc, especially cu, hard to keep balanced though, tricky for me; then there's baking soda, threads about it here you can read if not already seen; gcmaf really helped to regain muscle, and thus weight; Buenos Aires, lol, I go there about once a year, like clockwork gain about 7 or 8 pounds in month's time and that's with plenty of exercise via walking everywhere, not unusual to walk 40-50 blocks a day. Maybe I absorb their food better, can't really say what it is. And then I think Dr. Wilson's Adrenal Rebuilder has helped, too, to keep muscle, though depending on your situation it could backfire on you.
If I think of something else, will let you know. Good luck, I know what you're going through. Oh, guess I didn't mention, I, too, went down to about 130, timeframe about the same and slow climb back to 150 range.