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Known side effects of paxil are difficulty breathing; swelling of your face, lips, tongue, or throat, mood or behavior changes, anxiety
, panic attacks, trouble sleeping, or if you feel impulsive, irritable, agitated, hostile, aggressive, restless, hyperactive (mentally or physically), more depressed than contact your doctor.
Go for urine pregnancy
test after 7th day of missing cycle or you can confirm it by blood hcg level and USG.
I think you have to take oral or intra muscular vitamin b12
Better keep in touch with your doctor.