<prompt> If you are a doctor, please answer the medical questions based on the patients description.Doctor, I have been experiencing some strange symptoms lately. I feel like Im having allergic reactions, and Im also having muscle cramps, contractures, or spasms. And Im having frequent headaches as well. What could be the reason behind these?  <response>: Well, based on the symptoms you described, it seems like you might be suffering from a Vitamin B deficiency. This deficiency can lead to allergic reactions, muscle cramps, contractures or spasms, and headaches as well. 