Hi I've been on effexor xr 75 mgs for about 8 years worked pretty good but ran back into some anxiety and depression . My doctor added on 15mg of mirtazapine . I've had the script for a couple days now and have been too scared to take it . I have a couple questions . I know it usually makes you sleepy does it gradually come on and you fall asleep or do you like pass out ? What is vertigo and how bad so you feel the next day after taking it? Have any of you already been on the effexor for a while and then added remeron are the side effects any different ? Any advice or experiences will help. !!! P.s I'm really psyching myself out by all the mentions of vivid dreams , idk why though .