People do build up a tolerance to alcohol.
As far as what to expect in the future - don't drive yourself crazy.
Tomorrow you expect exactly what you have today, only a teeny tiny bit more, just like today is a teeny tiny bit more then yesterday.
Like this year is a tad bit worse then last year...next year will be a tad bit worse then this year.....and so it goes.
5 years ago life was different then it is today. 5 years from now, it will be just as different.
Alcoholism is progressive - and if you expect that - you will be way ahead of where I was 5 yrs in.