I thought posting the wiki for it may be helpful
Tinnitus Wiki
read through this great info source. there are things you can do to help it. not get rid but help 'deal' with it. Something to make background noise helps 'mask' it. a fan, radio, there are the "sound makers" that have like ocean, rain, heart beat, rain forest, summers night, that sorta thing helps a GREAT deal at night, as it should be obvious the more quiet your surroundings the more it stands out to you.
do you take in lots of salt, caffeine or nicotine?
or have you recently stopped or cut back the use of them ?
both using a lot and/or a cut back can both make symptoms worse.
to put it into my own laymen terms. imagine tiny hairs, in normal person these hairs stand upright in relation to surface, when you suffer tinnitus many of these hairs are laying more along the surface, like wind blown wheat.
and as t-dub pointed out there is really not much to be done, besides educate yourself and try to deal with it the best you can.
could be that, could be the way MJ makes different 'connections' in the brain with, neurons I believe they are called, creating a chemical reaction. I have experienced strange things myself. there have been times that I feel like I was about to pass out, very light headed and fuzzy feeling, and a following rush that goes through my whole body. not sure what that is about but its interesting feeling and scary at the same time.
Remember the very same flowers can effect us all differently. I personally like more of the sativa heady high better than the indica body high. I feel I relax more and I'm actually not to keen on the body high anymore, makes me nervous and panic-E at times.
Good thing you went to your doc to be safe. the human body is a very very complex machine.
best of luck to you