If you have reason to believe that Zoloft may help then it is worth trying in my opinion. Keep in mind that with anti depressants, you need to be patient and give them time to work properly otherwise there is no point in bothering.
Zoloft has a 3.3 rating on askapatient
askapatient.com/viewrating.asp?drug=19839&name=ZOLOFT
Also be aware that there is a yahoo forum for persistent SSRI side effects with over 3000 members
health.groups.yahoo.com/group/ssrisex/
A quote from that forum: “I have no idea. My penis head, shaft and testicles are all pale. My whole genital region is also numb, even anal/prostate area. Never was like this until I took Zoloft.”
Have you considered fasting or a paleo diet? both have a very impressive track record on this forum when it comes to beating brain fog. A lifestyle change would certainly be better than throwing more pharmaceutical drugs into your system.