There is no "normal" with these meds. Can't tell you if there's something other than withdrawal going on, but dizziness is one of the most common withdrawal symptoms. Some people get what are called protracted withdrawals, which means it lasts a long time. But again, can't know if this is what it is given you are the only you and our brains process things differently. And you're not the same you as the one who quit several years ago, you're the you that you are now. As we age, we change. A lot of weight loss in a short amount of time changes us as well, but usually for the better. Since the docs have eliminated the usual suspects, although you don't mention checking for inner ear problems, and since dizziness is such a common side effect both of taking these meds and stopping them, let's assume it is withdrawal. There are two things I can think of you can try. The first is to take a healthy dose of fish oil daily and see if it helps -- sometimes it helps with these symptoms related to brain zaps and dizziness. The other, and you're not going to like this, is, if it doesn't look like it's going away, is to go back on the drug at the last dose at which you felt fine and taper off even more slowly, as slowly as you need to. Even that is no guarantee, but it does work for many. Some people never manage to stop their meds, though that usually is associated with Paxil and Effexor, not as much with Zoloft. But it does happen, though it's rare. It happened to me with Paxil, but not with any other med. Well, there is a third option, which is to stick it out and hope that one day it's just gone and over with, which is what does happen with most people. I don't think it's your metabolism, though -- the drug was gone a couple days after you stopped taking it. What might not be gone is your brain trying to learn to operate naturally again. Best of luck, and keep up the exercise.
Ps - the weight loss was intentional through diet and exercise - ironic that I feel 10 times worse now! And I’m a 47 year old male. On Zoloft for many years, took a break a few years ago with NO side effects. But I was much bigger then and had fatty liver, so wondering if I’m metabolizing everything differently now.....