There are many groups here that have discussions on this subject. Take a look at these two for starters, and look around for more. I actually think, even without your master, it will be revealed to you when you are ready.
I would suggest a cleansing with some sage and then afterwards a sweetgrass. Also if it's bad right now make sure of course not to smoke marijuana or do any more until you get things under control. A daily Banishing Ritual of the Pentagram will probably help a great deal.
The 3rd eye is all about the endocrine system. pineal gland and pituitary gland.
The absolute best means of caring for these systems is to balance out the endocrine system. Your Endocrine system is the internal labratory where the alchemist truely works. I will leave a youtube video that give the basic Rites of Rejuvination. add to this a butt squeeze to stimulate the flow of hormones that will be released during these exercises. This is very basic and the system demonstrated is far more extensive than 5 exercises. However when completed over time, give it 21 days, you will feel the effect. You can do these slow or fast. I complete these in as little as 10 minutes evey morning.
Next an exercises to open and maintain a balanced 3rd eye.
AS taught from the Shen Tao Institute and Kriya Institute of Esoteric Science
from Sunyata Saraswati and taught me by Khalid Al NAshimmi Khonsu.
An excerpt from Dragon Wizardry
For this exercise, kinetic sensitivity is essential.
Breathe in Threw the 3rd eye, and exhale out of the eyes.
Breathe n the right nostril and exhale out the Eyes.
Breathe in through the left nostril and exhale out the eyes.
Breathe in the left nostril and exhale out the ears.
Breathe in the right nostril and exhale out the ears.
Breathe in both nostrils and exhale out the crown with (KO HUM)
Breathe in both nostrils and down to the solar plexus and exhale out the crown.
In both nostrils and down to the heart center and then exhale out the crown.
In both nostrils down to the throat center and out the crown.
In both nostrils up to the 3rd eye and then out the crown.
Do KO HUM (a sound that rides the breath) into the left side of the brain and then out the right side of the crown.
You should do this 3 times.
Relax (do Egyptian cobra breath if you know it) as you inhale up the spine ( with a mild tightening of the anal sphincter muscles during inhalation and relax this mudra on exhale) and exhale out the 3rd eye. do this 7 times. Relax and feel what is going on in your brain.