Feeling something Is going on in my head

Hello, I am 36 years old. I have been drinking alcohol since last 15 years. Just recently I developed a condition that after drinking alcohol the next I was unable to perform simple tasks like driving etc. I feel something is going on in my head. I am unable to concentrate on anything and feels like I will fall down or collapse any time. And also a sensation I felt is going around in and around my head. But this condition tends to go away after not drinking alcohol for couple of days. Now the problem is that it is already 3 months now that I have stopped alcohol completely but this condition has not gone away. It has become worse. I do not have any energy in my body from morning to evening even after taking 8-9 hours of sleep. I don't have problem falling asleep. I feel lethargic whole day. I feel like I will collapse any moment. My eye lids feels heavy. What is happening to me. And how can I cure this thing.