What are the odds of all three of us having the same symptoms?

Myself, my boyfriend, and my best friend all have the same feelings of being drained of energy and getting dizzy/lightheaded when we stand. He also has a headache, but she and I do not.

This wouldn’t be strange to me if it wasn’t for the fact that she is in Mass, I am in upstate NY, and he is in NYC. I haven’t seen her since last year and I haven’t seen him since a couple weeks ago, so it’s not like we could catch the same thing from being in contact with one another. I don’t know of any illnesses going around as of late, and no one else seems to know either. We are all keeping hydrated so I don’t think it is a case of dehydration.

Is it strange that we’re all feeling this way? Or is it just a coincidence and we’re thinking too much about it?