Is Aremis Lustral or a generic?

I’ve been taking Lustral for 12 months now. 2weeks ago I was given what was supposed to be Lustral by Pfizer but the box had Aremis 100 and Esteve. I questioned it and they assured me that they were the Lustral but spanish. I have felt very bad lately and I believe that it is because the tablets are not Lustral by pfizer but a generic. I just feel I have gone backwards. Anyone else been given Aremis as Lustral?