i think i also experiencing some effects from playing sims-getting dizzy while trying to sleep after playing,sometimes im getting "flashs" also while trying to sleep,and might wake up in the morning with dry mouth and white tungue..
im limiting myself to one hour a day for now and if it dosent help i might stop playing alltogther.
i think you are doing the right thing by stop playing for a while,it just dosent worth it
from my experience i know the doctors dont always know what to do,and i think its good you try to understand for yourself what is the reason for that.
also asking for gods help is always good
hiking in nature in the fresh air can be a nice hobby,you can challenge yourself by navigating using only map and compass ;)