Thank you for your query at DoctorSpring.com
I understand your concern and empathize with you.
The injury from the iv site could have been much worse, and it was the responsibility of the hospital to investigate further and keep you under observation.
Even though a hemoglobin of 8.4 is not dangerously low, I personally feel they should have kept you under observation for a few more days to see the trend of hemoglobin. If it was dropping continuously then another transfusion could have been planned.
Feel free to discuss further,