I have been experiencing light headedness, heavy feet when walking, dizziness, feels like I could faint for some time but recently more severe and common. Mainly when I am standing but it occurs when walking and sitting as well.  Experinced recent weight loss as well but with no change in diet or exercise.  I am a 45 year old male, smoke but does not drink.  No major medical conditions in my past.
Light-headed less described by u is postural related more in erect posture may be due to postural hypotension. Consult your physician and check supine and a standing BP and if abnormal go for detailed autonomic function testing. Hope my answer will help you. Take care.don't forget to rate me.