I think Luvox has crazy pharmacodynamic interactions... it affects your metabolism of other drugs, which is a bad thing.
As far as SSRI induced anxiety, you could try adding a drug that antagonizes serotonin receptor 5HT2A. Most doctors Rx antipsychotics to achieve this, right now I am using the tricyclic Nortriptyline which is made of pure win. Helps with both SSRI anxiety and apathy.
Putting someone on the third SSRI is a sign of a bad psychiatrist IMO. It is time for you to move on and try drugs with a different mechanism of action.