Hah ok. I'll do that but it's just weird that from my group of friends I'm the only one that seems to have the issue and I wouldn't consider any of them to be in shape either. But you're right, I should.
That's because altitude sickness is a tricky thing that treats everyone differently. Most people usually get acclimated to higher altitudes within a few days. There's a drug called Acetazolamide that speeds up the process, but you have to start taking it a few days before traveling to the mountains. I'd ask a doctor about it if I were you for your next trip. Otherwise just hydrate, take it easy for a couple of days and let your body adjust.