Reason why I suddenly got under eye bags...what type of treatment should I look for?

I do not think you are ready for eyelid surgery.  However, if you insist on knocking on enough doors, someone will operate on you.  You are missing deep volume in the buckle fat space at the top of the cheek.  Hyaluronic acid filler there and a small amount of volume in the under eye circle will restore the volume you are looking for.  This is likely to work as a solution for you for the next 10 to 15 years.  Find a very experienced injecting cosmetic surgeon who a track record of injecting the under eye hollow.  It is a bit fussy.  You are asking this person to sculpt your face.

These can occur at any age depending on your anatomy.  Allergies can make them worse.  You will notice that you have a deep tear trough.  Putting some HA filler such as Restylane into this will help to smooth out the area and decrease the dark circles.  It should last about a year.