Worried about my head injury?

At the end of April this year, i was hit by a car when i crossed the road. It wasn't the driver's fault. The car hit me at my legs but luckily my school bag was covering my legs so i didn't hurt them. It flung me and when i hit the ground i hit my forehead and got two puncture wounds. I was taken to A&E and they checked me over a few times and glued up my wounds, the doctor didn't want to do a scan on my head as he seemed to think i was ok and i don't really remember but he was pretty apprehensive, probably because i'm only 17 and there's a lot of radiation in ct scans. So i went home and recovered within about a week, i didn't even really show symptoms, no memory loss or blurriness or confusion etc. It's been in the last few months that i've noticed a big change, i started getting really forgetful and getting blurriness, struggling to concentrate etc and i've still got a bump which i know could just be hard tissue but i don't want to mage it in case it's a swelling or something. I've also been getting headaches recently, just about a couple of times each day. I've also been extremely tired in the last few months and it's been really difficult. I went to the doctor with my mum and the doctor asked me about everything, but i didn't tell her about the tiredness cause my mum said she would probably say it was just down to the tiredness and send me on my way because apparently that's the way doctors work, and she (the doctor) said that it could be a coincidence, like the bump and the symptoms, she didn't seem to think that they were related and she didn't seem too worried about it overall, i think she thinks they're just late symptoms but she contacted the Neurologists at my hospital and i was put on a waiting list. This was about five weeks ago and they expected it to be about six weeks before i could be seen to. I wasn't really too worried about it then, i didn't think much of it and thought it was probably just late symptoms or something really small, but recently i've been getting really worried and anxious. I know that i'll be going to the hospital soon for them to check me and decide if they want to do some kind of scan or whatever, and i'm really really nervous about what could be wrong. Does anyone think it could just be late symptoms? Or is there something wrong? What could be wrong? I really need some reurance. Thanks for your time x