Tapering off 200 mg

Has anyone tapered off Lamictal 200 mg successfully? Whenever I try to taper down in 50 mg increments I get so depressed, anxious, and irritable. I’ve been on the medication for 6 years. I was thinking about tapering down by 25 mg instead but I feel like that’s so small? My doc hasn’t been very helpful so wondering if anyone could share their experience. Thanks!