I havent play for a year and lost all of my gamerscore, it is 0 now.

No need to make duplicate threads asking the same question.

Looks like you've had a Gamerscore reset for modded achievements.

You need to post here
forums.xbox.com/.../41.aspx to find out for certain.

Im not sure exactly where to post this, so help or send me link of where to post.

I have a gamertag since 2006, and i now only use this for my xbox one, i can see all the xbox 360 games i played but they all have 0 for gamerscore and progress. I havent use my 360 in about 2 years then i got the xbox one when i was released, and have been
experencing this problem since. How do i get my gamerscore points added?

My account ive had for years now had over 400,000 gamerscore got a xbox one and all my gamerscore had gone had to restart from 0.

Only one thread per issue is required. This was answered in your other thread.

forums.xbox.com/.../1919615.aspx

Lost all my achievements too, after a few hours it returned to normal except for a few games i still have 0 gamerscore on and it looks like i have to play the games again to get them back