I think this is a good idea for you; however may not be a fix all.
I assume they'll check Free T3 for thyroid and do a 4x saliva cortisol test or at least include a PM blood cortisol test drawn before the lab closes.
Also look into methylation support--B12, folate, TMG, etc. Methylation is involved in many processes in the body including production of adrenaline and a natural amphetamine-like brain chemical.
Heavy metal toxicity is related to all of the above.