lucretia
Hi,
I was wondering how your situation was now, several months later. Do the seasons affect this? Has the situation improved at all?
What were you thinking about when this happened? You mentioned you were thinking very hard about something? What was going on for you emotionally at the time?
Sometimes, strange things happen to us because our spirit is trying to get our attention. Granted, your spirit isn't going to do negative things to you. But if you are doing something energetically harmful to yourself and you aren't paying attention to what's going on in your energy body (which includes all your energy bodies: spiritual, mental, emotional, and physical), you might not notice that there's something wrong until it affects you physically.
Now, your situation has you seeking more information about energy and karma, which can be a positive change. I don't know where you were at before, but what happened to you might just be information about yourself.
Because it affected your eyes, and eyes metaphysically represent seeing: what were you needing to see at the time? I don't mean this as a judgement against marijuana, but if you were using it excessively - more than your body wanted you to, or as a way of not seeing the truth about something in your life, the body might respond in that way.
If you meditate, perhaps meditate on knowing the answer to what this is about for you. If you would like some energetic healing work done on this, I can work with you remotely.