severe back and stomach pain including high body temperature

I am a 20yr old female with a perfect health record . Out of nowhere 5 days ago I started to have horrible pain in my lower back, my sides, and my lower stomach , its hard to move and I'm basically bedridden. My body temperature should definetely not be this high. I would love to go see a doctor but I simply just don't have the strength and its getting to the point where I can't even get up to make something to eat or even clean :( I can make it to the bathroom and sometimes the pain is kinda bareable to the extent of I can have sex . I read a lot of posts and most say that it hurts to have sex .. Well with me sex seems to make me feel abit better ... I don't know what to do :/ please help me