@OP, what is the difference between gambling fever and gambling addiction? From your post, I don't see any difference or any unique difference of things that have been discussed here before as a causes of addiction and how to prevent it. Both are too similar, if not the same.
I don't see any difference as well in gambling fever from the context to that of gambling addiction, had it been he was able to say that gambling lost fever or something similar, which we know that some may feels bad and react towards having any loss of it's kind, when they never expect that to come, then it gives them a kind of shrinkage towards gambling and they gets timidsin taking more steps to gamble for such disappointment.