No, there is nothing that can interact and make band 23 positive other than Lyme - that's why it's called a Lyme specific band. It will only react to the antibodies that are produced by your body when it tries to fight Lyme disease.
Yes, when a person has IgG bands present, it means that they are fighting a longer standing infection.
Talking to any doctors that are not properly trained, such as an LLMD, will only confuse the issues more.
And here's the thing - they are not supposed to treat based on these tests as they are for surveillance only!! Even the CDC recognizes this: "Lyme disease is diagnosed based on symptoms, physical findings (e.g., rash), and the possibility of exposure to infected ticks. Laboratory testing is helpful if used correctly and performed with validated methods."
www.cdc.gov/lyme/