Thought I would add some free advice, based on my first crash experience.

First point is that bitcoin is going to crash on a regular basis, so don't panic.

Its also possible to work out when its going to crash, because nothing should double in value within days - that is just stupid!

When it does that, you need to sell a little of your investment so that you get some profit.

Within a week or so, it will drop in value by about 30%, and that price will almost be stable and will last for a month or two, before it all starts to go nuts again. 

The point is that in the medium term, the next 36 months or so, the price is just going up.

On a daily basis, it goes up and down like a yoyo.  That is stressful, especially if you borrowed money to invest.

Don't check the prices daily! ;-)