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From your history, it is likely to be an inflammatory lymph node. It will usually become smaller once the infection is treated.  Sometimes, the swelling may not disappear completely.  If it is a few mm, it may be monitored for increasing size or pain.  If you are worried of cancer, please consult a doctor for an assessment. 
Dr. Lim K H
space doctor
It is understandable to be concern and worried if the lymph node is present for so long.  First,  it is important to ascertain that the swelling is due to a lymph node.  An examination is needed to properly assess this lump.  Please see your GP for a detail check up and treatment.  If necessary, an aspiration or biopsy may be to determine the nature of the swelling and the underlying cause. 

The chance of it being due to your hypothyroidism is low. 
Dr. Lim K H
space doctor