J.H.
Hi K.,
As a nurse of 20 years, I can tell you most assuredly, yes, you are overreacting. Your sister is and will be fine. Choose your "battles" carefully when you are obsessive. You will drive yourself crazy. If this is a constant problem for you, ask your doctor about it and see if there is a medication he/she would recommend for you. Life should not be a worryfest. Take some meds, do yoga, pray, redirect your thoughts, anything to bring you peace of mind. I myself have had blood drawn and had the tourniquet touch the needle. I have never spent a moment's time worrying about it. God bless and take care.