In a worst case scenario you'd end up with an infection and having to get the tooth pulled. that really is the worst that could happen. I've had a tooth that's been crumbling for a while now and it hasn't caused me much grief. I think dr google was probably eluding to an entire tooth shattering.
But if you've already told the dentist and they were confident enough to book you an appointment 5 days out, I'd say your gold. Take it from someone who's had multiple dental problems. Now if your tooth starts to hurt - and I mean really hurt and you get a fever, then worry about infection. Chances are that won't happen, however. The dentist will probably be able to repair the tooth in 5 days. :)
From what I understand you're in no immediate danger.