This can either be emotional, physical , mental or all of the above. Anxiety causes mental stress through worry.
Have the necessary tests and if they all come back all clear move on . I have found oranges as a good mechanism to reduce Biliruben if your stomach can tolerate them. Try not to worry I know it can be hard but your mind is also very affective in manifesting symptoms to suit your illness.
I too suffer from GS and have had 4 bouts of high BR over my lifetime in blood currently about 1.85. I believe my most recent bought had been brought on by work stress and physical stress.
At its worst I had typical GS symptoms for about 4 yrs. At it shortest they have lasted about 6 months.
Also stop all Alcohol consumption while you try to get your liver back to as normal as possible ( for me that was lowest total BR reading of about 1.2)