A crush injury (my take on a kick by a big-un) should have medical attention sooner than later. There is a possibility the new swelling is a harbinger of a potential rupture of "something." I am not wanting to scare you - but you are scaring me - but think about the artery you mentioned. What if it "nearly" burst and now needs support/surgical repair and you do not realize it?
Check it out if you can.