Zoloft- is it really working this fast

I’ve been on verpamil for about 4 months, recently my Neuro added Zoloft and took me off Cymbalta. I’ve taken the Zoloft for only 3 days but I swear I have noticed a huge difference in the vertigo. I haven’t changed anything else. I was even able to go to the mall today and shop for hours with my kids without coming home and ROCKING ROCKING ROCKING. This must be psychosomatic as I know it takes SSRI’s 6 weeks right?