How Should Forehead Dent Pain And Headaches Due To Injury Be Treated?

Hi about 6 years ago I ran into a lamppost very hard, knocked me out for a couple of seconds and then I woke up. I had severe brushing to eyes, noses, neck. The impact was just above my left eye, there was a small cut. Once healed month later I noticed I have dent about 1 inch long where the impact was. I just left it and carried on with life. Every now and again I get headaches and dull pain where the dent is. When I get a cold it's even worse as the pressure seems to be on the dent. It's been 6 years so can't see that it's bleeding into brain still but just want to know if the dent can still cause pain few years on. I dud have a spell of dizzyness for about 3 months about 3 years ago but I put it down to stress. I didn't go doctors as I was petrified they would say I had a tumor or something. Silky I know but I have panic attacks to do with health anxiety.