constantly tired, constanly thirsty, severe headaches

You could have diabetes...go see a doctor immediately. It could be other things but you have the symptoms.

You have sleep apnea. Try a sleep study. I had the same issues.

You could have diabetes insipidus.

Hi there,
All the symptoms that you have described point to diabetes. If you are having problems with looks of energy during a day and you feel dehydrated all the time then you might be having issues with diabetes. have you measured your blood sugar level in past several weeks? Headaches are usually side effect from high blood pressure caused by abnormal levels of glucose in your blood. You should test your blood and see if there is a chance that you are becoming diabetic. Also have you changed anything in your diet in past several days? Try to see if you have issues when you insert too much carbs in your body during the day.
All the best,
Danella

Here are the symptoms I've been having for a while - I feel severe headaches, chest pain, weak and always tired, and thirsty all the time. What is going on with me?