Pounding Headaches: Often the first and most common sign.
Difficulty Sleeping/Sleepless nights: Restless nights or waking up frequently due to lack of Oxygen.
Fatigue or Weakness: Feeling Weak and Extra tired after activity and not full strength.
Nausea: A general uneasy stomach/Lack of appetite/Vomiting
Loss of Appetite: – Not feeling hungry or skipping meals.
Dizziness or Lightheadedness: Especially when standing up quickly.
Feels like a Hangover: Lots of the time headaches, dryness, feeling out of it are altitude sickness compared to a hangover