Actually its not the sedation of mirtazapine that causing the current symptoms, but the increased amount of drugs. I just realized Im having muscle myalgia and increased body temperature like a flu - similar to when I very first started on SSRIs but not as severe as I'm used to it now.
This initial body adjustment goes away within a week, and is the main reason why they start you on the lowest doses and then gradually increase. Basically I get to feel like a dead zombie for a few days, also I want to go to a volunteer centre tomorrow to get some work placements to boost my C.V.
At the very first when I started on SSRIs at the start of 2014, such symptoms were scary, but they happen and go away in a few days once the body is used to the neurotransmitter increase.
It does work to calm down a hyper reactive response to venlafaxine very effectively though.