I am not able to take B complex by iteself because it upsets my stomach and makes me dizzy. I have taken the B6 by itself w/o any problems. You may want to keep a daily diary of the time you take the B6, what was going on that day (hard work, stress, fun activitiy, etc.) and when you get dizzy/how long it lasts etc. and see if you can find a pattern. Take the diary to your doctor the next time you go to see if the doctor can find a reason. Do you have low blood pressure

Does B6 affect blood pressure?? Have you tried stopping the vitamin regimen to see if the dizzy spells go away?? If you are not happy w/ what the doctor said please please go to another doctor for a 2nd opinion. You know your body specifically. Your doctor knows bodies in general. Your body may not fit the "textbook" description. Good luck.