I have been sick for months, primarily with nausea, always in the morning and sometimes all day. is there any way to know for sure if this is coming from mirtazapine withdrawal? or any experts in that field who could help me know if that's what it is?

Do you take medications,supplements or have any chronic illnesses that could be causing the nausea? If you've been off mirtazapine for months, withdrawal symptoms should be long gone. Have you lost appetite,weight? Could this be depression? Have you tried usual home remedies or antinausea meds? Seen a gastroenterologist? If no organic cause, try hypnosis therapy.