Suggest Treatment For Swelling In The Lip

Last thursday I had a fall . I bruised and cut my lower lip - it is still swollen . Ever since I have been constantly swallowing. I know that I am tense -especially my jaw. I keep trying to relax but this seems to make it worse and I tense even more. I recall that I had this problem in my teens when I was anxious. I am now 69 years old and have a problem with an underactive thyroid which is treated with tablets. Can you advise please?