I tend to go with lots of hot peppermint tea with honey in it, which at the very least tastes yummy (though I find it really does help more often than not). Also, drink lots of fluids in general, and rest your voice as much as you can until it heals up. But don't whisper instead of talking normally! I know it seems counter-intuitive, but whispering is actually harder on your vocal folds than normal talking is; they have to stretch tighter in order to produce a whisper sound than they do to produce a normal speech sound. Good luck!
I've strained my voice A LOT (sadly :c I sing a lot and when I tried to change the way I had been singing for 11 years... well... lets say it was painful) and what you should do is avoid talking. Thats always the best thing to do. Its the quickest trick and the most effective.
Don't mind me, I'm just piggybacking because apparently I was preemptively blocked (unless I interacted with this person before, but I honestly don't recall). And I had this nice little reply ready and everything!
OP: Don't freak out - that won't help you at all! Your voice probably just needs rest because you were spending over three hours shouting over loud music. It happens with my friends a lot after football games, though I haven't experienced it in years.
Don't do things that might dehydrate you or your vocal cords, like consuming caffeine. Instead, keep your throat moist by drinking lots of water, perhaps have honey and tea, and suck on cough drops. Avoid talking if you can.
Evidently I may be wrong. I've been told in athletic activities that caffeinated beverages are dehydrating. Apparently they can still hydrate you (although caffeine is a weak diuretic), but not as much as water so you have to drink more.
Still, I don't think coffee and soda are good for a sore throat. Tea's probably soothing.
Speaking as someone who's had untrue rumors spread about him on other sites, you should never preemptively block someone. Only block them if they harass you personally. Most of those "troll lists" are made my immature kids who can't handle the admittedly dark humor of the people who lurk about in the Complaints forum. Granted, some of them have crossed a line once or twice, but as you've just seen, most of them are decent helpful people and you're only harming yourself by blocking them.
Don't listen to rumors, judge people for yourself.
The people labeled "trolls" are usually pretty funny if you don't take them seriously, and don't do much unless you go in Complaints and don't play along. I'm not usually all that bad (I think), though I do enjoy Complaints.