Antidepressants making me feel odd.

I’m on my 5th day of Mirtazapine and I feel awful. My arms and leg muscles physically hurt to move , I feel drained and Im tired all of the time. It’s like the life has been sucked from me I feel in a dream state everyday😣 I don’t feel any better mentally , probably worse. Anyone else suffer on this type of antidepressant?