Help! There's a big black spider under my bed, and I'm terrified!?

It's mive! Not like one with really thin legs either, they're really thick and black! I had a panic attack when I saw it, and my mum tried to Hoover it up and it went under my bed! There's a load of crap under my bed, boxes and bags and stuff, I can't see t anywhere ( but if I did see it I'd probably faint anyway)...please help me, I know I won't be a ble to sleep tonight, help???