Is it normal to feel extremely weak and tired 5 days post-op rhinoplasty?

I've mainly been in bed, and I force myself to eat and shower. A couple of days ago, my surgeon prescribed me antibiotics because I had a fever, and to also prevent infection. But is it normal to feel this weak and tired? I feel like I have a constant headache, and everything feels like a chore, including showering. I was told I'd feel better once my splint is off tomorrow, but the way I feel now, everything seems like an impossibility.