Our expert says:
Getting dizzy after a blood draw could be a autonomic nervous reaction and is not dangerous. The bruise is caused because you should put pressure on the vein after drawing blood and she may not have done this long enough to give the blood a chance to clot. The other dizziness you experience may be due to low blood pressure (a feeling that you are going to pass out) or a middle ear problem ( vertigo or a feeling of the earth turning around you) It can also be caused by iron deficiency anemia or heart arrythmias, so maybe you should have a proper medical check up.
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