But I also heard you shouldn't stay on this type of drug because it is highly addicting.
Not true on both counts. People have taken benzodiazepines (BZDs) for decades without having to increase the dose. Indeed, most take less over time. But while they are not addicting, if you take them daily for more than a month or two you will probably become physically dependent on them and need to slowly wean off over some weeks or months if you need to stop taking them. This is also true of antidepressants. HOWEVER, BZDs are not good primary, taken daily, anti anxiety meds because doctor are becoming increasingly wary about prescribing them which means you cannot be certain you will get a prescription in the future. So they are best used only occasionally for breakthrough anxiety. Long term, antidepressants are a better bet.
I am terrified to start another SSRI in fear that I will get bad start up effects again.
A couple of possibilities. You could try another SSRI, I suggest Celexa (citalopram) which is usually the best tolerated SSRI, starting on a very low dose and taking Ativan, or another BZD to nullify any additional anxiety the Celexa might produce. Celexa comes in a liquid form which would enable you to start on as little as 1mg.
Alternatively, you could try one of the older tricyclic class antidepressants (TCAs) such as amitriptyline (Elavil, Endep), or imipramine (Tofranil). They are much less likely to produce severe initial side-effects, plus they come in small dose tablets relative to their therapeutic dose so you can start out on a very low dose. The minimum therapeutic dose for these two TCAs is 75mg, but you could start on half a 10mg tablet, which is 1/15th of the minimum effective dose. By comparison, the 25mg Zoloft dose was half the minimum effective dose. The trade off is that TCAs tend to have more ongoing side-effects such as dry-mouth and constipation.
My Dr. actually said something about Buspar.
Buspar (buspirone) is a unique drug, neither antidepressant or BZD that can be effective for GAD, and sometimes social anxiety. The problem is that it only works for a few with most finding it no more effective than M&Ms. However, it has few if any side-effects so is worth a shot.
You should also consider therapy if your medical insurance covers it. The cognitive and/or behavioural and/or mindfulness therapies can be at least as effective as meds.