how long until brain damage

[Therascaldude]

ok, here's the story. About 2 years ago i bumped about 2 lines of
meth/crystal by drinking it with orange juice It kept me up
for 2 nights and then i came down, recovered, and everything was
fine.....fast forward to about a month ago. I found out I'm moving out
of the country in the middle of March and deicde to party it up with
friends before i leave. So, in early February me and some friends start
doing meth 1-2 times every other week, usually about 2 or 3 average
lines snorted within a 2 or 3 day period. Well, recently, after
about a week and a half break without meth, me and a friend end up
having a crystal party weekend. We snort a few lines, stay up, next day
go on a road trip and meet up with other buddies, snorted about 2 or 3
lines more that night, and then the next day got about 4 hours of
sleep, and snorted about 3 or 4 more lines to keep us up through the
night and allow us to stay awake for the drive back.......and what a
crazy drive it was.....yea, so......fast forward about a week and a
couple days to this past weekend.....didnt do any meth or any drugs at
all within that week and couple days......friday night- 2 medium lines
got us going good. around 2 or 3 am we each did a small line of
coke.....that made the fun even better!......saturday - did about 3 or
4 more lines......cant remember exactly........and ended up getting
about 6 or 7 hours of sleep......sunday- no drugs......slept....
monday -2 or 3 lines........tuesday - 2 or 3 lines.....today - like 5
lines.....and by now i can hardly feel anything when i take a
line.......way different and way less then how it used to feel.
Anyways, as you can see i'm still somewhat on it and my question
is......







If I stop now, will i keep my brain from getting damaged....?