i don't consider the price going up $25 in a short time to be a bubble. if it went up to $800-$900 right now after sitting under $400 just a few hours back, then it would be completely different. right now the price is recovering to its normal price level. it was about to happen and many people were expecting it to happen within this month, and it did.
It happened very sudden though
Yes, that's bitcoin. How long have you been following the price? Back in 2013 when we hit $1200, the price swings could take your breath away. The fluctuations you're talking about are only sort of big and not really surprising either. We were at $450 last week. So I would say just hodl.