Suddenly dizzy and no energy

[Minime85]

Partner has just come in from walking the dog and has suddenly gone extremely dizzy and exhausted. Gone very cold and clamy. Wondered if anyone knows of any bugs that do this? So unlike him and has literally had to go to bed. All I can think of is flu?

i get like this when my blood pressure or my sugar levels drop.
after 2 cups of tea and biscuits/cake ,im usually ok.

I wonder whether it is a bug. I had adapt like that last week. Had dreadful dizzy spells in the morning. When I was in town, shopping, suddenly found that I could not walk in a straight line - kept veering off to one side, as if I was drunk. Shaky and cold. Felt awful. Stopped to have tea and a bun in supermarket cafe, felt marginally better, finished shopping. Made it home, asked dc to put shopping away while I went to bed. Bed felt like a boat, rocking on waves. Slept on and off through the afternoon and evening, similarly slept badly that night, but following day dizzy was and shakiness were gone, I just felt drained. Some sort of 24h virus?

Thank you both, gave him two mug fills of sugary tea and he is feeling much better already. Was bizarre just not like him at all he isn't a man flu type or anything