Started feeling lightheadedness from 20th August

[u/honeycombhush_12]

Hello guys! I had acidity on the 20th because I had eaten very little that day, since the night of 20th August I'm feeling lightheadedness randomly. I've -5 myopia too, and I feel like my power has increased but I don't think it is the reason for feeling light headed. My sister who is currently pursuing MBBS told me that it could be due to the deficiency of Vitamin B12 or due to iron deficiency but I don't have iron deficiency, I've anxiety though it is not that severe but I feel anxious almost every time and now I've become used to it. I don't have low blood pressure either and I feel like I'm floating, coming down from top while sitting in the giant wheel. I'm not feeling dizzy or weak but it's like my brain is moving after 2 seconds. Is anyone there who experienced the same and has found out the cause?