Professor Trelawney's "experience"

[GKJPO]

No: HPFGUIDX 54900

As I continue through my gagillionth read of GoF, I ran across this 
curious passage (Ch 29 The Dream, p 577 US):

"You were clutching your scar!"  said Professor Trelawney.  "you were 
rolling on the floor, clutching your scar!  Come now, Potter, I have 
experience in these matters!"

Ok, this leads me to the question...  what experience?  How does 
Trelawney have experience in curse scars?  If she had said that he 
was "seeing" and she had experience in that, I would understand, but 
she is suggesting that she has special knowledge with respect to 
curse scars.  I am interested to hear how others interpret this.

This is followed by the following:

"My dear, you were undoubtedly stimulated by the extraordinary 
clairvoyant vibrations of my room!" said Professor Trelawney.  "If 
you leave now, you may lose the opportunity to see further than you 
have ever--"

This paragraph seems to be some major foreshadowing to me.  
Apparently, in her classroom, Harry would have the opportunity to 
explore the hidden powers of his curse scar.  Could Trelawney's 
classroom open up some big doors for Harry to fight LV?  I think so 
(plus I think this is the only reason for Harry to remain in 
Divination - so that something like this could happen).

Another thing I would point out is that Harry usually seems to have 
his dreams in her classroom that is hot, stuffy and the air is 
scented...like, say, a flower bed in the middle of July.  Could the 
flowerbed Harry is lying in in the beginning of Book 5 stimulate the 
same response as Trelawney's classroom?

I apologize if this has been discussed before.  I haven't noticed it.
Kristen