I read your question and I understand your concern. From your description it appears like the skin in the areas around your eyes and the ear has gone dark after the hit. That is a bit of a worrying sign, because it could be what is called raccoon eyes created by hemorrhage under the skin around the eyes due to skull fracture after a trauma. Of course I would need to see that directly to verify it, a description only could at times render the wrong impression and you don t give many details about how did you hit your head, how severe of an impact it was. For that reason I think you need a medical evaluation no matter how busy you are, because if that is indeed what I described, imaging tests are certainly needed. Hopefully it s just a bruise or puffiness around the eyes and I am making a big deal out of it, but you have to make sure especially since you mention drowsiness as well. I hope things work out for the best.