Phenergan is the usual drug and Safe but makes you sleepy. Tigan is a good one between Phenergan and Zofran.
Every doctor has a different choice.
If you have a repeat c-Section without labor, spinal is a good choice. If you had been in labor and then the c-Section you may have been feeling the huge amount of pressure from the surgery. That is common because the epidural relieves severe pain, not all pressure. VBAC is a good option, especially if you are NOT induced. Every pregnancy and delivery is different even for the same mom.