Hi Connor, and welcome to the community.
Zoloft was the last drug I tapered off of, and it was tough. It took me 2 years to finally get off it, slow is the name of the game. I used the hyperbolic method of tapering - not more than 5-10% of the previous dose.
If you haven't already, check out this for more info on tapering Zoloft:
https://taper.community/drugs/zoloft
One bead at a time ⚪
Oh, and you're right to be skeptical of the doctor saying your symptoms are returning. Docs don't seem to understand the withdrawal process, even though they should. Every psych drug prescription should come with an exit plan, and that's not in their wheelhouse.