do enlarge in front of ears ,they enlarge because of some infection around if u dont have ear problems ,gum problems then u should see whether u have Dandruff
.If its there buy an antidandruff medicated shampoo and rinse ur hairs .lymphnodes will go in no time.
Blood clot occurs if there is any trauma that u can tell whether u had or not..
Blood clot get dissolve but takes time 1-2 wks.
Blood clot doesnt cause brain anuerysm .Anuerysm is ballooning of blood vessel.Clots can cause blockage not ballooning ...but such clots which are big ie u can feel it or palpate it doent diloge like that as they are out side the blood vessel
So do not panic and take proper treatment written above.