Hi I want to welcome you to the boards, by the way.
Is the pain lower right, middle or lower left? All the time? Intermittent? I might try a heating pad if it feels good, if not I might try cold. I would also get an ear irrigation bulb and irrigate the back of the throat with warm salt water using 1/2 teaspoon salt and 8 ounces of warm water. I would stir the salt and water together well by using the bulb to draw the solution in and out several times. At night I would wet a hand towel with warm water cover it with plastic wrap this around the neck with a bigger towel outside and clip it. I would leave it 3-4 minutes, ice the neck 30 seconds, and repeat this complete activity 3 more times finishing with cold, dry real well then cover the neck with a different perfectly dry towel and go to bed for the night. I would do this each night until it feels good again. Sometimes fairly young people have heart disease. The arteries can build plaque or the valves can be damaged or murmurs can be present when born.
It is important to drink plenty of water but not too much and not too little. sjb