My therapist recently switched me from Gerozac, which I had been on for three years, to Lustral, after I had a particularly bad depressive episode lasting about eight months. I prefer the Lustral to the Gerozac as the latter numbed me, but on my new meds I get these really sudden dark periods that I didn't experience on Gerozac - my depressive episodes were never sudden and lasted a lot longer. Does anybody else have this experience?