Hi,
I understand your anxiety concerning taking medications because of their side effects. I hate to take anything because of side effects.
Zoloft reacts differently for everyone. I took Zoloft for a short while for panic but I didn't give it long enough to work for my panic because I quit taking it due to the side effects. I experienced daily diarrhea, stomach upset, loss of appetite, headaches, sleeplessness and worsened panic I attribute to the side effects.
That being said, two of my sisters and a niece take Zoloft and they have no problems whatsoever. In fact, they really like Zoloft and what it has done for them. So it really depends on how your particular body chemistry handles certain medications. You really won't know unless you try it.
Like I said, I understand your anxiety about taking it, especially if you fear it will aggravate an already existing problem (Nausea and vomiting). You should discuss this fear with your doctor and maybe you can start on a low dose (25 mg) and take it slow. Just see how it goes for a couple of weeks. That should be enough time for the drug to get into your system to see how you may react to it.
Good luck!