hello , today i was on my skateboard going down a hill , as i picked up some speed i lost control and the skateboard turned sideways causing it to stop but to send me flying and as i fell down with by back facing the direction i was going i hit the ground and whiplashed and hit my head really hard..i had a hat on..in my opinion that is the only reason i didn't cut my head open..it was on asphalt..soon as i fell down i checked my head for blood but nothing..since i was on the street i got up right away and had a HUGE bump where i hit my head and immediately after i had fell down i felt a pressure in my ears..it hurts as if its clogged badly or so...i read some articles stating that the symptoms of concussions involve vomiting etc...so am i alright? or should i get it checked?