Im sorry to hear about your situation. Now prozac (fluoxetine) and cymbalta (duloxetine) belong to the same family of SSRIs and switching them with one another would not cause any issues however that being said since you were on the drug for 20 years , it is to be expected that you would suffer from some withdrawal symptoms as your body adjusts to the new drug. Now as far as combining them is concerned, you should NOT combine these two drugs together as they have a serious interaction with each other which leads to the levels of cymbalta rising to seriously high levels which could cause life threatening effects. Using both of them together can also trigger serotinin syndrome which is again a life threatening side effect which can cause high grade fever, generalized body rigidity, seizures, coma etc.
SO i would suggest that you DONT use prozac with the cymbalta as that would be dangerous for your health, instead you can have your doctor prescribe you a common painkiller like percocet or even lyrica which can play a role in controlling the symptoms here.
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