Well I can't say what metabolic pathway lgd takes in the liver but if you can determine what CYP pathway it requires to be metabolized I can easily help you from there. I am sure it is metabolized by the cytochrome P450 system to some extent and therefore could be effected by numerous supplements, prescription drugs, misc. compounds, foods, etc.
I will say this about olanzapine... I do not know what your goals are with LGD but if it is to bulk, and you are already overweight or have a higher BF% and may have insulin sensitivity issues, I give you this caution: The U.S. Food and Drug Administration requires all atypical antipsychotics to include a warning about the risk of developing hyperglycemia and diabetes, both of which are factors in the metabolic syndrome. Of all the atypical antipsychotics, olanzapine is one of the most likely to induce weight gain based on various measures. There are some case reports of olanzapine-induced diabetic ketoacidosis. Olanzapine may decrease insulin sensitivity. It may also increase triglyceride levels. It is also a dopaminergic anatagonist which may in turn raise serum prolactin levels in the body.
As far as your SSRI, I think you have nothing to worry about.
Clonazepam can interact with certain compounds but most of the time the only concern there is inversely raising clonazepam serum levels to supratherapeutic dosages that couldn't be achieved without CYP induction or inhibition at said dose.
Good luck bro. Just be careful with your diet when using olanzapine.