hi, I just had total knee replacement APril first. I am always exhausted (blood tests all in normal range), severe headaches, nausea, elevated blood pressure. I am progressing well in my phyisical therapy.. but these symptoms and loss of sleep or nightmares pretty much wipe out my day. Id this normal, if so how long till I am back to normal. (I am monitoring my BP 2-3 x a day for 3 weeks as directed by my doctor.)