Thanks for choosing health care magic for posting your query.
An enlarged lymphnode can occur due to many many different reasons and most of the reasons are very trivial. Even a simple pharyngitis
or ulcer in mouth can also cause increased sizeof the lymphnodes
comes very down the order. Considering you previous history of anxiety disorder, you shouldn't worry much and start taking treatment for the anxiety by visiting a psychiatrist
Coming to your specific question:
No! Anxiety and hypochondriasis
doesn't cause an enlarged lymphnode!
Hope I have answered your query. I will be more than happy to help you if you need any further clarifications.
In case if you want to discuss with me directly you can use the link:
Wish you a good health!