I had something similar happen to me in the hospital. I was getting a blood transfusion while they induced labor 7 weeks early. I was really sick. They did the blood transfusion over night and a nurse stayed by me the whole time. When the transfusion was done she said she was going to take a quick break. Well 15 minutes later she came running into my room and asked if someone had taken my blood while while she was gone I said no. Well they had test results for me but never took my blood.

I was in the hospital by myself. My husband had just started a new job I called him and told him to get his butt down to the hospital and I called a friend who live close to the hospital. She throw on clothes and came right down and only left for an hour when someone else showed up. She went home took a shower and came right back

I hope they find your blood soon

Good luck