As a "quick-fix", tou may want to try stopping Milk Thistle. In my experience, this powerful liver cleanser has thrown many into "symptom-city". It's excellent later in the detox cycle but can be really difficult if taken too early.

It makes perfect sense that your problem is potentially liver-related considering your symptoms. You may want to try going off it for 2-4 weeks and see if there is a change.

The bottom line here is (most likely) that your liver phase I metabolism is faster than phase II.

If you have the the Cutler book Amalgam Illness: Diagnosis and Treatment, look on page 40 and 41 for a detailed explaination of this and it's relationship to MCS and specifically how this is related to the liver. On page 40, he has methods to inhibit phase I (which should help significantly) and on page 43, he has a chart showing a number of things you can do to increase phase II (which should help significantly).