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Hello from JustAnswer.
It does not matter that you do not have the proof. The reason that the blood work is being done is to show whether you are immune. If you had the vaccine previously and the blood work shows that you are immune, there is no issue with the fact that you cannot prove that you received the vaccine. If you are immune, then the vaccine would not be necessary. And there would be no problem with you being a volunteer if you don't have the vaccine.
If I can provide any further information, please let me know.
Even with the hole in the heart and the stroke, if you are immune, then there is no need for the vaccine, and there will not be any issue with being a volunteer.
If the blood work shows that you are immune, then there is no need for the vaccine, and there will not be an issue with not receiving the vaccine. And that would be true even with the anemia.
Since you keep asking about these conditions, are you not sure whether you had the vaccine when you were young?
If you are certain that you received the vaccine when you were young, then the blood work will typically show that you are immune and the vaccine will not be needed, and this would be true regardless of which other medical conditions are currently present. I am not sure why you keep asking about other medical conditions, because none of the current medical conditions will alter whether you are immune from the previously administered vaccine.