Dexedrine and SSRI

[Daytona71]

SWIM is prescribed 40mgs./day of Dexedrine and also 60mgs. of a drug called Cymbalta(duloxetine hydrocloride). This is an anti depressent. SWIM had thought that the Dexies did not create any euphoria because his/her receptors in the brain could have been damaged due to 2 decades of meds for a serious back injury and 3 surgeries.
Now I read that the combo listed could be dangerous, even deadly. I do not abuse either of these as the Dexies do not work even with higher doses. Should I stop the Cymbalta for a while and see if the Dexises work better or even for safety purposes though the info I read said the doses had to be quite high and Seretoin Slash(?) was rare? Help please and THX!