Do I have a concussion?

Early this morning while still in a groggy fog, I was trying to close a door in my hall way, because the window in that room was open and it was drafty. Not paying attention, a pull-up bar that was resting at the top of the door fell down on my head, and it hurt. I did not lose consciousness, and there was no blood, and as far as I can recall I didn't feel strange initially. It just hurt. But since I couldn't detect any blood and since I didn't feel funny I went about my day as usual. But as the day progressed I have felt very tired, weak, headachey, and there is a lump on my head of moderate size where I was hit, and it is rather sore. I also feel a tad woosey. Do I have a concussion? Do I have any reason to be concerned or go to the hospital? I'm fine enough to sit here and write this question out, I just feel off and not very good. I tend to get anxious about things, so I wanted to get someone's opinion.