Hi, there. We aren't medical professionals here, but I think it's very important that you, at the very least, call your doctor and find out what you should be doing. If the Paxil had stopped working, your doctor may want you to try something else. Even if you go back to the Paxil, there might be a specific way that is best to do it, perhaps by tapering off the Cymbalta gradually while re-introducing the Paxil, I don't know. Please talk to your doctor, it's his job to help you in this situation.
Thanks for your question and hope you soon are feeling better.