you probably damaged the sciatic nerve--- sounds like it could be the tibial portion of it... the sciatic nerve divides into the fibular and tibial nerves around the back of your knee...
nerves regrow at a rate of about a millimeter a day... so you're in for a long recovery as far as the sensation issue goes... and there's really not much you can do to speed it along...
as for the pain in the posterior hip, i suggest some PAIN-FREE stretching and whatever easy exercises your MD says you can do... if it persists, follow up with it... it's kind of difficult at this point to say what it could be without actually seeing you...

good luck


patrick