I have done something to the powerpoints in 3 rooms I went to use hairdryer and it shot out a little fireball so guessing I have blown the hairdyer but the wall sockets arnt working what do I do have I blown something on the inside of the wall socket or something I'm hopeless with this stufff and will I have to call out an electrician??

I'm definitely no electrical expert but that happened to me a while back with a heater.

It sparked at the power board and we had no power to half of our house (it is on 2 grids or something)

Turns out it just blew a fuse.

Have you checked your fuse box for any broken ones?