Sir/mam, Actually from last few months i have lighteadness in my head. Like i also feel sometime weakness like i feel like faint not fainting but having feeling like faint, but there is no pain in head nothing, sometimes blurred vision and from few days i have pain in my legs very mild pain, so is it some serious issue sir, i am so much worried, and i gone through test blood my vitamin d level is 3, i m taking treatment for vitamin d , is there any serious issue in head