Oral / Dental :: Strange Nerve Sensation From Tooth To Chest...?

It's not a pain really, just a very intense sensation. I've gotten it before when getting a dental cleaning...I don't know what part they hit but it shoots down my neck into my chest. This doesn't happen everytime I get a cleaning--in act it's only happened maybe 3 times total.

And I also have gotten it--and this is a bit embarrassing but pertinent here--when nipples are stimulated. I even read somewhere else that some girl got some weird tooth nerve sensation when her bf was playing with her in that area. Not quite the same thing but still never related.

I phoned my dentist today b/c I felt some sensation IN my tooth left side bottom, as that's where the sensation comes from if it starts in the mouth. She said to come right down. They took Xrays and looked at my teeth and found nothing. However they did say I would need a crown and a filling replaced at some point on that side of my mouth, bottom. But she didn't think that would cause this feeling. She told me it's nothing to worry about. I asked if it could be a nerve and she said that the nerve from the tooth branches out into other nerves, so yes maybe.

That's all well and good but it's very annoying to say the LEAST. Once that nerve(s) is stimulated, it takes maybe a minute to go away. However today, I still feel a sort of 'tickle' in that area (chest) where the nerve sensation was. Plus the feeling in my tooth is new.

Anyone know which nerves these are or why they're sensitive all the sudden? Or even why touching those areas stimulate it?