New or increased anxiety is very common with other classes of antidepressant/anxiolytics but isn't frequently reported with the MAOI's like Nardil and Parnate.
If you've just started the medication this may be a temporary side effect that usually resolves within days to a week or two. If it's persistent or interfering with your life you should let your doctor know and get her/his professional advice.
Best regards and I hope you're feeling better quickly.
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