Thanks for writing to us.
The pain in the back of the throat and the mild blood that you have seen is likely to be related to the throat irritation
caused by repeated vomiting
. It does not seem to be related to any serious ailment.
You can attend ER for a direct examination and treatment.
I hope this information has been both informative and helpful for you. You can consult me again directly through my profile URL http://bit.ly/Dr-Rakhi-Tayal
Dr. Rakhi Tayal