Canker sore underneath tongue! Can anyone give me some advice? Has anyone been through this same path?

About a week ago I got what appears to be a canker sore right underneath my tongue, located right on top of the vein. I thought it would go away with time but it continued to grow and boy is it painful. I feel pain for anything a slight movement of tongue while talking or even breathing. Now a week after it still hurts but it's seems to be healing but leaving a sore of scar. Is this normal for canker sores to do? I have rule out because from all the information I gather only occur in lips, gums and roof of mouth, while in other area canker sores occur in movable parts of our mouths (cheeks and tongue). This is so stressful, because I want to communicate with people but it hurts.