Acupuncture side effect

I went to acupuncture 4 days ago (3rd treatment) for my hand and back pain and since then I feel a weird pins and needles sensation all over my body I didn't have any problem after first and second treatment, I contacted my acupuncture but he is out of office and I'm afraid this is a serious side effect and actually it is an uncomfortable feeling.
anyone here has idea what might be the problem and what I should do?

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