I Gave Been Using 300mg Of Enlafax XR For A

I gave been using 300mg of Enlafax XR for a long period. It causes me to sweat uncomfortably and my doctor recommended a switch to Brintllix. I took less and less Enlafx until one week ago and then began using the Brintellix.
I have been feeling nausea since I started the new drug and have found myself very depressed. I am not sure whether to persist wight he Brintellix or return to the Enlafax. Is it safe to simply switch back?
Regards,
Simon