I think changing medication is an excellent idea if you aren't feeling well. So is adding additional treatment options if you aren't already doing so, which I'll mention in more detail in a moment. However......I personally don't feel that a competent medical practitioner would choose adderall as the next option after you have tried only zoloft and klonipin. In particular, this article suggest it has only shown some success in SOCIAL anxiety, so unless that is your particular diagnosis, I'd think again before opening that can of worms. Especially since you've had panic attacks.
So what are other options? Another SSRI, one that is more stimulating than zoloft. Prozac would fit the bill. Most psychiatrists will try a second SSRI before moving out of that class though it may not always be the case. Even then, they are more likely to go for something like Cymbalta or Effexor before venturing out into other medication classes that generally have a higher risk profile. Buspar is another potential choice, either added to an SSRI or by itself.
I know it's tempting to try something with a "novel" mechanism of action but so far most of those haven't fared better in studies than the SSRIs and benzos.
If you wanted to try a novel approach that is safer (and more common) than adderall, there is a medication called guanfacine (Intuniv) sometimes used for ADHD restlessness that a small yet substantial number of people have had success with for their anxiety. or propranolol for the purely physical anxiety symptoms (won't affect the mental aspect, but it can settle down panic)
I'll follow-up this post with some good non-medication strategies that can be helpful to add on to your treatment if you haven't yet, but my daughter wants to play so I'll do that in a bit!