if i go do hoover dam can i keep going wiith the new add ons or does it end can i have to go back to my last save before the dam?

No,you cant continue after hoover dam.

welll that svcks and with two other add ons coming out they need to fix that thanks

There will be no DLC to continue after the Hoover Dam. Bethesda/Obsidian said so themselves. It would ruin the ending to a very good story.

hey the easy way is to set some hard save points well before hover dam, they you can try all the different paths