Really bad bottom back pain - spreading down to my leg!?

For the past month I have been having problems with the bottom of my back. I've just been in pain when i stretch, but over the past week it has got gradually worse. The pain has now spread down to my right leg, and I am finding it hard to sit in a comfortable position as it hurts from the bottom of my back,... show more For the past month I have been having problems with the bottom of my back. I've just been in pain when i stretch, but over the past week it has got gradually worse.

The pain has now spread down to my right leg, and I am finding it hard to sit in a comfortable position as it hurts from the bottom of my back, right down to my right thigh.

I am also finding it hard to sit straight and the pain in my leg is causing me trouble when try to get up and when supporting myself.

Any idea's what it could be or what i could too to help! Thanks :)
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