These meds can change personality. Paxil changed mine, it made me more aggressive, impulsive, and angry. Zoloft doesn't sound like the med for you, assuming you need a med at all.
Yes see your Dr. but also it may be time to get off zoloft, I hope you worked on issues concerning your Panic Attacks, the zoloft is a aid in clearing your mind, but not a cure. how do you feel about getting off zoloft (tapering) and see how you feel?
Zoloft gave me back my life, (it's all in my open Journals in this forum). I was already on xanax, then my Dr. tried for 2 years to get me to take zoloft , I would not, then I started it and it aided in weaming off xanax, then I weamed of zoloft, I was out driving again , even went on 1000 mile drive by myself for hockey! (prior to this , I was close to be homebound)!
Go back to your doctor. tell him how you feel. Ask for a different medications.