help what's going on with me????!!!!/!!

hey guys I'm 36 weeks. We'll tonight since about 11pm and it's now 3am I have been having these pains in my legs my pelvic and bad back pain. the baby keeps pushing down and I keep getting these sharp knife pains in my vagina and I've ped like 10 times already only a little bit though I think from all the pressure. I have taken a shower eaten everything I can't get comfortable and I'm miserable and very irritable and sometime the pains make me yelp out loud. what is going on help!!!!