I agree, go see your doctor. I recieved a head injury during the last 6 months of my drinking. I had a concussion (which is essentially bruising of the brain) not just to the front of my brain but the back also. I had dizzyness, nausea, was very tired. I did seek medical advice. Ultimately, the head injury was bad enough that it caused dizziness for 2 years after the injury. It also changed how I learn. I used to have a photographic memory, would make A's in school without studying. Now I have to work to get a C or B. I no longer have a great memory.
One of the reasons a practicing alcoholic is more prone to head injuries is because the alcohol abuse creates dehydration which reduces the fluid around the brain that it there to cushion and protect the brain. Just a little trivia for you.