I had 3 anxiety attacks in the last 12 hours. What does this mean?

Schedule an appointment with your family doctor. When the doctor asks what brings you in today show them what you have written here. Use that as a basis for having a frank discussion on how you are doing. They can do a full physical and neurological workup to see if have a medical condition that needs to be addressed. They can also check if anything you are taking or doing may be causing or contributing to your issue. They can refer you to a mental health professional who can evaluate your mental state. Be sure to show them what you have written here also. Once a diagnosis has been made, treatment options can be discussed.

You should look into anti-anxiety treatments.

it means you need to clam yourself down. don't stress about why its happening anxiety can make you feel literally anything it wants and I mean anything just calm down what ever makes you feel good . grounding yourself and moving around will help along with a smell you like. you can always take a pill but it is better to try knock it down