Hi welcome to Health care magic forum. Though the procedure of epidural puncture of the spine are safe , there are some side effects due to effect of steroid
, infection,duralpuncture, numb ness of the spine, etc. Majority of them usually subside within 24 hours.
Your description suggests that there may be infection or gatric hyper acidity. I advise you to consult your doctor for follow up visit so that you may have the problem diagnised and for correct treatment.
Besides i advise you some diet recommendations as avoid taking more of spices, chillies, junk foods, and oily foods. Completely avoid taking nonvegetarian foods for few days.
Wishing for a quick recovery and thanks for calling.