I was diagnosed with a concussion, now have dizzy spells?

27 male no real medical history. I was in an accident 5 months ago and was diagnosed with a concussion. A few days after I was very dizzy with headaches. I still have the headaches and I was told I can have them for awhile. The dizziness kinda faded away with random spells every now and again but for the last week and a half my dizzy spells have come back and they are worse then ever. I still have the headaches along side them. Should I be worried and should I get checked out. The last spell I have was tonight when I was driving to work and I got so dizzy I ended up in a ditch. I have 0 prior dizzy spells. Never had one before the accident.