Anxiety Support Group
Anxiety is a physical condition marked by intense and persistent feelings of distress, fear, angst or dread. General anxiety caused by routine day-to-day stresses usually passes quickly and is experienced by almost everyone at one time or another. However, such feelings that linger over time and are very difficult to cope with, and which lack a clear cause, may indicate...

Ask your Dr. please.
Why do you need diet pills?
the Zoloft is probably necessary..so I would stop the diet pills until I talked to a Dr.
If you are not experiencing any side effects, just continue to keep track of the pattern.
I understand that you need to talk to your doctor about side effects if you're having them. For me, I mentioned what I was doing, and the only request my doctor had was to be seen more frequently, and that combination is working out so far.
Best wishes.