Hi there, thank you for posting your question. My answer is not intended as a substitute to visiting your own doctor but I hope I can be of some little help.
The problem with the Depo shot as is that it reeks havoc with your menstrual cycle. I am not sure what your stomach pain is but it probably is not connected to the Depo shot. Good luck.
Dr Andrew Rynne.
www.andrewrynne.com