Well, remember this, your body is becoming more immune due to this sickness. It may be that you're suffering now is actually helping you to build a resistance that is going to help you to avoid a similar, but worse illness down the road.
This sickness may also be teaching you something. I know that when I get sick, it reminds me of the importance of washing my hands and not putting my hands anywhere near my mouth when I even suspect that I touched something questionable.
Also, I've learned that being sick actually adds to life a bit, something to learn and feel. Honestly, I rarely get sick, and sometimes, it's just nice to change things up a bit and have to rest for a day with the flu. I'll tell you one thing I'll never get used to, having to blow my nose incessantly. I hate that, especially when I'm trying to do something.
Don't worry, you'll get better, but you need to try and learn from this whatever lesson you can because that's the point of suffering, really, is to learn. Perhaps learn better how to avoid it, or how it gives you the ability to sympathize with others rather than just empathize, or learn the specific reactions of your body to the illness so that you can better detect it's coming next time, or learn how to better take care of the illness for when someone you care about contracts the illness or something similar to it.
However, I will still pray for you that God's glory and purpose will be fulfilled and that you will get better with due haste.