Dear Goontag,
What you are experiencing is the flow of Soma in the upper chakras of your psychic body. It is a form of Divine Grace and acts upon the body of the sadhak in exalting the state of his meditation. If you are anywhere near Kolkata in India, I could have taken you to my Guru in dealing with the same but I shall not more than this in a public forum.
Regards and may God bless you in your pursuit!