Yesterday, I was just standing in front of my kitchen counter when I started to feel like I was going to pass out- and I did. I got a slight ring in my ears, had spotty vision, and cold sweats. I fell completely backwards without catching myself. I woke up within a couple seconds and within a couple seconds I stood up and realized what had just happened. When waking up, I felt clammy and slightly disoriented but other than that nothing unusual! Now my head is very sore and I have a lump on the left occipital of my skull. My neck is also very sore and almost seems to be slightly swollen (mainly on the left side). I have a terrible headache as well. Should I have any reason to worry or seek medical help? Why did I faint?
P.s. I had eaten that day, drank plenty of water, and had enough sleep.