It's Anaemia. You honestly don't need to go to a hospital. The problem is there's an oxygen carrier substance in your body called, haemoglobin, which is composed of mainly iron. When the iron level in your body decreases, the ability of the haemoglobin to transport oxygen will decrease and when oxygen doesn't reach the parts of your body like your heart or brain, you'll start showing symptoms like nausea, headache, unclear vision etc. The cure is to boost up your iron level which can be done by eating foods that have high iron content like eggs, liver, green veggies, and drink some vinto. If your situation is a bit worse and you need to compensate for the lost time, there are iron pills in pharmacies that you can buy in cheap price.
Hope it helped.
Jun 27, 2021