| Oh dear, toothache!
It could be an infection, but your sinuses are all interconnected so it's not uncommon to feel the affects in your throat or your nose.
Get to a dentist ASAP.
the cheapest way to fix the problem is to have the tooth removed - it's fairly cheap, and you won't miss a wisdom tooth. You could have root-canal treatment to cut away the bad nerve and clean up the infected tissue, but a wisdom tooth probably isn't worth keeping, so go for the cheap option.
In the meantime, take anti-inflammatory pills (paracetemol, or whatever you prefer) and clean your teeth thoroughly - use an extra-strong mouthwash (don't use mouthwash too often, because it dries the mouth, but sometimes it's a good way to kill bacteria).
If your gum is infected, use an analgesic gel such as anbesol. If it's an acclusion - a hole in your tooth - use clove oil.
You will find that when you try to sleep at night, that's when the pain gets worse - it happens when you lie down - so take painkillers before bedtime.
From now on, clean your teeth EVERY day, and use dental floss (use it gently) because there is a high chance that your other teeth are also at risk; you may already have another tooth dying on you, but you don't know it yet! Prevention is better than cure | 
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