If you follow the advice I posted which came from my voice teacher and I've had to use myself, your voice should be back to normal within 3 days or so.
As far as singing lessons, a voice teacher who knows what they are talking about will teach you how to breath properly and how to use your diaphram and belly muscles to push the air to give you the volume you need. We hurt our throats when we try to pull the volume (the air) up using our throats (and vocal folds). When you push the the volume (the air) up using your diaphram, your throat is relaxed and is pretty much resting doing nothing more than shaping the sound as the air passes through. That's the reason that opera singers can sing a 4 hour show at amazingly loud volume and walk off stage without any change in their voices. It takes practice to develop the feel for it, but once you do, you will find it rather comfortable and you'll easily be able to sing as loud as you need without problems.