What diet pill would be best for me? (less caffeine!!)?

I need a diet pill that doesn't have a lot of caffeine in it (or ANY caffeine at all) due to my anxiety.. I really want to purchase some diet pills, but ALL of them that I have seen have a lot of caffeine in them.. I was wondering if anyone knew any diet pill that is out there (not TOO TOO expensive) that would be more likely to not effect my anxiety negatively... also, nothing with nuts since I am allergic :) I have taken green tea pills in the past, and they sped my heart rate pretty good and didn't help my health. If anyone knows of a product, let me know thanks!