Sometimes when im just sitting and i stand up and start walking , my eyes just black out i feel lighted headed , my legs start to lose control but then in a matter of seconds i snap back to normal , is it something serious?

You may be dehydrated. Drink enough water daily so that your urine is mostly colorless. If that does not resolve the symptoms, it would be prudent to see a doctor. Wish you good health!

Sounds like your blood pressure drops transiently when standing abruptly. This may be a side effect of medication, but could also be due to dehydration. Since not feasible to be fully precise based on your post, have this assessed by your local doctor.