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Dear Ms. Kaido,
Yes. its because of infection and removing the source (tonsil) can help the node regress.
I want to reassure, is it 137 KG !! in that case I would strongly advice you to start running / walking and reduce your weight to atleast 100 Kg in next 1 - 2 years. Now that you are aged 40, you are very prone to develop all cardiac and other complications as years roll on.
I hope you are regularly doing your pap smears and mammograms. Annual physical examination with relevant screening tests can help you detect risk factors / early signs of cancer if any. But the most important health issue in your case with be cardiac complications which would be very difficult to manage if your weight does not come down.
Please take these words seriously and start your physical activities daily. May be you can keep a record with me intimating how much you lose weight every month.
Hope I addressed your concern.
Regards.