The Alcohol Experiment

This post is about a strange thing that is happening to me regarding the effects of alcohol, or rather the no effects.
I would appreciate comments or feedback,  especially if anyone has had a similar experience, or is aware of any documentation of others who have.

In the past few years I have rarely had any alcohol, as it made me feel so sick. The sensation of being even mildly drunk was awful. I would get a hangover from just a couple of drinks. It just wasn't worth it .

Recently a friend invited me out to dinner. She recommend a red wine to go with our meal. I decided not to make a fuss and agreed to ordering a bottle of this wine. I had two glasses of it and didn't feel a thing. Then I had a third and still nothing. I wrote it off to it being a very mild wine, small glasses, and the fact that I drank it with food. I  was certain I would pay for it the next morning with the usual headache. Nope, not even a twinge of a headache or sick stomach.
We did the exact same thing a couple of night later and I had the same experience. 

A week later after work, this same friend asked if I would   like to go for a quick drink after  work at the local pub.  I thought what the heck, since I had handled the wine so well . I had two  bottles of beer this time  with no food. Once again, didn't even feel the slighest buzz, so I had another. No ill effects the next day either.

OK, so this past Friday night we went out for dinner again with a  group. I had two vodka and tonics.
We didn't enjoy the food so we decided to go to another place nearby  for a night cap. I had another two vodkas. The last drink, the waiter warned me that he hadn't measured so it might be a bit stronger and he brought me extra tonic for it. Yeah, no kidding stronger. I'm sure it was close to a double, so that makes almost five drinks in a couple of hours  and I DIDN"T FEEL ANYTHING!!    The next day same deal, no ill effects.  

Now I have experience with drunkenness, so I know what it feels like and I'm telling you I felt nothing. It was like I had been drinking water all evening.

I'm not planning to become a drinker. I simply pushed myself to have those drinks because it was so strange to feel nothing, when normally I'm buzzed after one drink .

More weirdness in my life  The experiment is over, because I am a little freaked out by this.

Are my brains so fried that I  no longer feel anything?