I think I have Lyme disease. An express care facility took a blood test, but say results wont be back in until maybe Wednesday. I feel terrible. I've been bitten by a tick a few weeks ago, but did not see a rash, so stupid me did not worry. Currently, I have extreme fatigue, joint pain in knees, headaches, and fluctuating fever. Would an ER be able to diagnose me faster, so I may begin treatment earlier? Thank you.