If you have an enlarged lymph node
and it goes away then it does not portend anything serious. However, lymph node swellings when they appear usually do not disappear that fast so that there was another cause for the swelling. Bruising and swelling in another part of the body are not usually related so are headaches! Cut down on your caffeine intake and check out to see if you have any other cause that is provoking anxiety
and leading you to worry more about your symptoms!