Greetings Madcap...

Question for you - have you been practicing meditation, engaging in intensive prayer/praying, and/or have you been pursuing a spiritual path/understanding in life?

The reason I ask is because there are some internal changes that can occur within an individual which can bring about the sensations that you are describing - in this context the symptoms are transient (temporary). I experienced something similar to what you are describing, but without more information from you I cannot suggest one way or another... Also, do these sensations by any chance feel more pronounced at night when you lay down to fall asleep?