Thanks for writing in to Healthcare Magic!
Avanza contains mirtazapine
which enjoys a very safe side effect profile.
The side effects you are having are dose dependent and are related to Avanza so reducing the dose would help decreasing the side effects.
Now you are having done with the stressors so I think this is right time to taper the drug to older stable doses.
If you have any further query please let me know I would try to answer it for you.
Wish you a great health!