To me, without further context, it would mean that the speaker is suffering from some form of neuralgia. Various physical conditions involving nerves could be thus described. Is there context that tells you the speaker is frightened or anxious, that her pain is purely emotional? (You're permitted to quote up to a total of four sentences from the source. If your source is online, a link may be helpful.)
The link is indeed helpful. It's an excerpt from a typical example of the genre known as the Gothic novel, a dreadful form of literature I gather is still popular in some circles. Your quote is the author's way of saying that the speaker finds herself sexually aroused.