IgE Group
Blood type O has antibodies against Type A, B and AB. Transfusion would result in a massive allergic reaction to your own blood and quick death.
Only if the person is already allergic to that antigen. Not if they are immune to the antigen. The word antigen refers to the protein that joins with the antibody. If the antibody is of the allergic type (IgE) then an allergic reaction will happen and if the antibody is of the immune type (IgG, IgM or IgA) then there won't be an allergic reaction.
Anaphylactic shock.
An extreme allergic reaction is called anaphylactic shock, and it is fatal if not treated very promptly with epinephrine.
Allergic reactions are not typically a trigger for a vasovagal nerve reaction. However, there are a number of known triggers, as well as some unknown. Any type of nerve malfunction, stress, or pain can trigger a reaction, so the symptoms associated with an allergic reactions should not be ruled out entirely.
Delayed hypersensitivity reaction.
Comes from Anphylaxis, serious allergic reaction. Just specifies type of shock.
What type are the symptoms?
It could be from a specific type of condom you have used or if you used any lotion or any type of, "lube" you could easily get a allergic reaction from it. Best to see a doctor if it does not get well over time.
An allergic reaction will usually occur within 1 or 2 days of exposure.
A sore red sting mark
Jewelry that is uncomfortable or jewelry that you make have an allergic reaction to should not be worn.