pins and needles
noun [ plural ] uk/ˌpɪnz ən ˈniː.dəlz/ us/ˌpɪnz ən ˈniː.dəlz/
（身体某部位的）酸痛，发麻，针刺感
If you have pins and needles in a part of your body, you feel slight sharp pains in it, usually just after you have moved from being in one position for a long time.
Idiom
on pins and needlesidiom US为即将发生的事情而担心（或激动），如坐针毡
worried or excited about something that is going to happen
Don’t keep Margaret on pins and needles – give her a call. 别让玛格丽特担心了，给她打个电话。