I got americana'd pretty bad in my first tournament as a white belt. That was over two years ago and it's still not 100% back to normal. I maybe took a couple days off. A lot of the posts summed up what to do for the most part: ice, communicate with training partners, tap quick & often, and be on a quest to know how much danger you're in in certain positions. I don't really get americana'd now and I'd like to think it has something to do with knowing firsthand the damage it could cause. But in the gym especially, tap. Some guys might go for the finish 100%, some guys won't, but I've found that the harder I resist and struggle, the more painful the finish. There should develop a point of no return to admit defeat. A hit to the ego is way more worth it than an injury that takes you off the mat for days or weeks on end.