How long does it take for mirtazpine to start working

Had to change from 30mg of cetalopram because i could nt sleep at all on them ,to

15mg of mirtazpine (first 7 days) then 30mg . My mood has nt improved at all as yet

im still very easily annoyed and bad tempered , i started on 30mg after 7 days but don t sleep very well on them so dropped down again to 15mg and sleeping better , can anyone tell me how long they take to make you feel better im getting bit fed up feeling like this . Will be getting a talk to my doc next wk for a revue not sure weather to stick with them or change ?

Hi 

I noticed the side effects straight away like drowsy and dizzy vivid dreams ect 

hope you feel well soon wink

At the minute i have all the bad effects of the drug like drowsiness and a crazy appetite but no good effect when i tryed cetalopram i felt like nothing bothered me ( no bad moods or agitation ) but couldn t sleep at all so had to come off them and on to mirtazapane been on these for 12days and not feeling my mood changing at all if anything im maybe a little worse .,, not good im going to give it a wk and then go to the docs although not sure what advise ill get , iv got to the stage where im fed up trying different drugs and waiting to see how i fell .

I know how you feel been on different meds for 20 years came off the mirts Sunday now on venlafaxine again no more side effects it was hell on those merits felt so drugged up and felt suicidal on the 4th day