The cold that won't let go

I've now been sick for 3 weeks. I have my appetite back (darn), but not my energy. When my alarm goes off I actually consider not getting out of bed (that never happens), and then the whole workout feels hard. Wednesday my lungs were burning and I felt like I was running a 5:10 pace. Then I looked at my Garmin- actual pace was 9:57. Even Zumba felt hard last night. I've slept so much that I now lie awake at night, had so many fluids I have to go to the bathroom every 10 minutes, and eaten so my fruit that the acid from the citrus is eating away my mouth. And I'm still not better. Grrrrrr