I have been drinking coffee for a very long time, usually one cup in the morning and one in the afternoon.
Here recently I have become light headed upon standing after drinking the one in the afternoon. I have taken my blood pressure and heart rate when I have felt like this and it is normal. I have also taken my blood sugar level and it is normal. I work out 3 times a week and drink plenty of water daily so I don't feel I am dehydrated. My sensation of near faint are becoming worse.