OP If you are of a nervous dispositions then virtual currencies are not somewhere you should be looking to invest. Buy some old car or antique and sit safe in the knowledge that it is increasing by a small % every year.

If however you able to deal with risk and have some perspective on the amount you invest, ie you can afford to lose all of what you invest, then jump in.

Bitcoin will go down and it will go up, just like the sun does everyday.  

Price of bitcoin last May was around $2400, currently after a drop its $7,924.89, OP That's a 3 times increase in 12 months,, please show me an investment that has done that in a year and not experienced any drops.