Vicodin can cause nausea and vomiting and together with Zoloft which can cause nausea you may have your answer. You said you take other RX meds so it may be the whole combo.
You may want to check back with your MD if the vomiting continues as you could become dehydrated. I wish you the best.
Moderator Anxiety ~ Panic Disorders
*~* Not a mental health professional at all *~*
Dx: Anxiety/Panic, Depression
_____________________________________________________"If you doubt you can accomplish something, then you can’t accomplish it. You have to have confidence in your ability, and then be tough enough to follow through.”