I am a 24 yr old female.  I have had a problem with lightheadedness and fainting over the past 6 years or so.  It has gotten worse.  I fainted in the bathroom, resulting in a concussion.  I have been told I have low blood pressure by multiple doctors and that my BP dropping was most likely the culprit.   My pulse ranges from low 40s to 100s.  I have noticed my heart racing and feeling strangely over the past 2 or so years. Moreover, I become fatigued very easily.
Hi, Welcome to Chat Doctor forum.  It appears that you must be having the epilepsy, or infection of the internal ear, or gastric hyperacidity, anemia, or hypo protinaemia etc. I advise you to consult a physician for diagnosis and treatment. You may need to have an MRI of the head, E.E.G besides other tests for confirmation.  Take more of green leafy vegetables, pulses, sprouts, and protein rich foods to improve the blood, and general health.  Wishing for a quick and complete recovery. Thank you.