OK, so here is what I did to repair this issue:

- Completely closed out the client and restarted until it showed me the NA/EU server list (first time it told me it could not update the JP list)
- Did my normal "num 0" spam but at a much slower pace due to the "Unable to obtain JP world list" a few times.
- After about 4 attempts it went back to normal (both world lists showing/no error/quick change from Start screen to character screen) and continued num 0 spam
- Hit the "Cannot obtain NA/EU world list" error again after about 15 minutes of standard num 0 spam.
- Completely closed out the client and restarted.
- Went back to standard num 0 spam for another 10 minutes and then was thrown in to queue.

It seems that it's just the pain of having to keep doing things over and over and over and over, but you will make it there at some point, I promise!