ANNNNNKKKKKK!!!!!!
If your voice is shot you need to eat lots of raw fruits and veggies and drink lots of water. You need to rebuild and recover tissue. Call it overkill but the quickest most abundant and readily available source of what you need is in RAW fruits and vegetables. Just like at the other end of the spectrum, no coach or teacher or doctor will EVER tell you "eat a few slices of Extra cheese pizza to help you recover." Its the same reasons. Just different ways of putting them. You can say the sky is blue, or the sky is not green. Both are true of the same subject.
At the VERY least drink lots of water and no caffeine or sugary drinks. Just water. You also need to talk as little as possible and whispering is worse than talking. Any vocal teacher or doctor will tell you the same.
If your corRAB are sore then they could be inflammed from overexertion, etc, or if you have a cold(or even if you don't, though moreso if you do) they could actually be infected, as in laryngitis. This is one of the few times that you want to do absolutely nothing vocally. If you have a cold and your corRAB hurt but you don't want to go to a doctor to find out if they are infected, then youre rolling the dice. Just know that. You also pretty much want to avoid medicines that end in INE. Such as Pseudoepenephrine,(good luck) a very common one, because INE is basically a way of saying CaffeINE in some medical formula type of way, and it will help flush water out of your system, including your corRAB, thus the reason why they are in decongestants and the like, because it unclogs your congestion by thinning it out with extra water from your body.
Everyone wants an easy way out in situations like this but sometimes there are none, unless you can afford/arrange steroid shots and the like.