<human>: Can you provide a brief rundown of the text in within 3 sentences?

I'm in my late 30's. In my life I recall 3 severe concussions, and at least 4 minors. The first severe one was as a child when I crashed my bike and, as was the norm in the early 80's, didn't have a helmet and smacked my head on the sidewalk. 2nd was as a teen via a kick to the head (the several minor concussions were also at the hands of a violent home life), the final was in 1999 in a very serious car accident.

I've noticed the past few years my memory is getting pretty bad, which the doctors had warned me about. The weird symptom I have now is something I noticed in the years after the accident. I feel the effects of substances ridiculously quick. As in if I drink a beer, I open the bottle, take a swig, enjoy a conversation, take a second swig, and as I swallow I feel my cheeks flush, I get warmer, and I feel buzzed. It passes, it still takes a normal amount of alcohol to get drunk, but I feel the effects almost instantly.

The same for medicine. If I take a Lunesta (sleep aid) pill when I brush my teeth, I will have trouble getting to the bed without falling over, I learned to have a glass of water and take the pill after lying down. 

I'm not saying drugs work instantaneously, like if I take Nyquil my cough and stuffiness isn't cleared up in seconds, but in just seconds I DO feel the "my brain just detached from my head and I'd floating away" sensation that other people say they feel about 10 minutes later.

I hope I am explaining this clearly. One of the worst effects of my memory issues is the loss of vocabulary :(. I have talked to several doctors who say they believe it to be a side effect of concussions, but there haven't been any specific studies on it to say for certain. I was wondering if any other Redditors have similar symptoms after similar experiences?
<bot>: medicine and other drugs start taking effect instantly for me, alcohol gets me buzzed almost instantly. Doctors cant say for certain if it's related to concussions, asking if other concussion suffers experience same,