Weaning off of zoloft symptoms and conditions

I have been taking zoloft for 14 years for panic disorder with mild depression. various doses, but now im at 200 mg, and have been at that dose for a long time. it was like a lifesaver from my previous med, imipramine. i did have really vivid dreams, weird ones, for a long time, but not so much anymore. i think that the long term effect of taking it has taken a toll on my mental clarity/concentration, though. I feel like i can't concentrate on anything or complete a thought anymore. even typing this i feel like i'm getting lost. like i'm constantly in a fog. or it could be that i have 5 month old twins, lol, i guess. but really, its never been this bad.
i too feel like i have had some loss of emotion, not feeling sad when its completely appropriate to. and i've also had way too much emotion at the wrong times, flying off the handle at people and such. the worst thing is my dr. would ask me "what makes you happy, what do you do for fun?" and i would just stare at him with a blank look cause i had no idea what that felt like anymore. or maybe i couldn't think enough to answer him. physically i think zoloft makes me twitch - eye twitches, nose twitches, throat clearing. and i can't have an orgasm to save my life :(
recently i've been having some breakthrough anxiety and my dr. wants to add wellbutrin to the zoloft. if anyone has experience with this please send me a message. i'm kind of scared to do it.

I'm having a LOT of trouble sleeping! I can go to sleep, but I don't stay asleep, and when I wake up, I just feel like my muscles are all tensed up and I need to stretch out all the time. I toss and turn and can't get rid of that feeling like I want to jump out my own skin. I'm tired all the time because I can't sleep...I've tried taking it at different times throughout the day, and nothing works.