Do I have a concussion?
I went sailing today and as we were packing up the main sail the boom suddenly swung and hit me just behind the right ear. It was very painful. Over the next 2 hours I had a very intense headache, I became really tired and had trouble keeping my eyes open and I felt really ill. After the 2 hours I gave up and had some nurifen. Now after 8 hours my headache has come back, I am feeling a little ill again and I have a good sized lump on the back of my head.
Do I have a concussion? Should I be worried?