Hey I have had my tongue piercing for 3 years now an out of the blew the last three days it has been hurting.

At first I thought I had pulled on it in my sleep but when I look in the mirror it looks normal there is no slight tearing at all.

So have been checking up on it everyday to see if it's infected but there is no colour change, no discharge but there is a slight swell! So what could be happening?? Please Help!

It could be the start of an infection. Start garggling with a medicated mouth wash and just keep an eye on it. If you are concerned go and see a doctor. It is possible you might of tugged at it in your sleep and not realised and the swelling could just be trauma.