I had my augmentation was 2001 and they were saline. How do I find out what kind?

You should have received a device identifier card at the time of surgery which would specify manufacturer, model number etc.

With regards to your specific concerns, it is highly unlikely that your symptoms are related to your implants. BII is a contentious topic where much research still needs to be done. There is no medical test which can confirm an association let alone a cause or effect relationship.

As always, discuss your concerns with a board certified plastic surgeon (ABPS).

Did you receive an implant card, also known as a medical device ID card? The card should have the serial numbers of your implants. You can also contact your surgeon's office as they should have that information in your surgical records. You’ll be able to find out the brand, size, and type based on the serial number associated with your implants. However, if you’ve noticed a recent change in size you’ll most likely need to get your implants replaced.

Thanks for your question!
You may have that information with your surgical paperwork. If not, contact your surgeon's office, they should have a record of your implant information. Best wishes!