Here is something else,that can be done for instant relief: 1) You can try 'Toothache Drops' available at pharmacy.
2) Application of Clove Oil to the aching tooth is best to reduce pain. Clove oil contains eugenol which is very soothing to exposed tooth.,Place a drop or two on cotton pellet and place it on the tooth if if there is any cavity/decay.
Other than this you can also to the following at home to reduce the swelling,also application of heat sometimes does help to reduce pain,You can start rinsing frequently with hot salt water solution-- dissolve ½-teaspoon of salt in 8 ounces of water as hot as you can tolerate without burning the mouth,and rinse for two minutes every four hours, this will provide you relief.
Also avoid eating, hot, spicy and hard food.Donot brush hard or chew hard foods from that area. Keep that area clean and free from food particles.
Other than all this,visit your dentist as early as possible and get the tooth properly evaluated and filled by conservative means.
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