Hi, I fell very hard on my shin bone approximately 5 weeks ago.  The shin was black and blue and I could barely touch the injury due to pain.  I walked on it within a couple of hours and it was sore but okay.  The following day it was very sore and for a week I could not point my toe or pull my foot back at ankle due to soreness on the shin.  I did not injure my ankle but within a couple of days a severe bruise appeared at my ankle and across the front of my foot.  Although all the bruising has gone,  this ankle is swollen every evening.  Should I get this checked out?  I am flying long-haul in about three weeks and I'm nervous about blood clots?  Thanks for your help.
You surely need to get it checked. There might be underlying fracture that is causing these symptoms.