Overbite/overjet - Would surgery be worth it to correct this?

It is normal to have some overbite and overjet, 2 mm being the "normal" amount.  Being so close to the norm, treatment is likely to be insignificant.  If you have difficulty swallowing, then the overbite/overjet may not be the issue, and there is a skeletal issue.  The term "vertical maxillary excess" is sometimes used here, and would require surgery to correct.  While no surgery is fun and painless, most people report they wish they would have done it earlier.

Consult with an orthodontist, and if surgery is needed they should be able to direct you.

Sounds like you may have some issues with your TMJ (Temporomandibular Jaw Joint).  It is not a wise idea to undergo either Orthodontic or Orthognathic treatment until you have an evaluation of your jaw joints.  The best person to evaluate the health of your joints is an Oral Medicine Specialist.  Provided that your jaw joints are healthy, a combination of orthodontics and orthognathic (jaw) surgery may be a good alternative for you.  While surgery is expensive, often it makes the most sense for correction of very difficult malocclusions in non-growing people.  The trick is to make sure that the jaw joints are stabilized prior to undergoing any treatment!!  You may need to wear a "splint" for several months to stabilize your joints before a treatment plan can even be formulated.

Dear friend,

Please do yourself a big favor and check out non-surgical approached for your correction.  You have what is know has TMJ Dysfunction or TMD.  This means your jaw joints are out of alignment and dysfunctional probably caused by your lower jaw getting trapped behind the upper teeth.  This should be corrected by a dentist who has a great deal of experience with these disorders.  It is likely that your jaw will be brought more forward with this phase of treatment.  Then for the next phase you could have your bite and teeth alignments corrected, which may include widening your upper jaw, then braces.  Look at a few of my before and after pictures to get an idea of what I am talking about.  Good luck to you.