I consider the anti-depressants I used to take at the insistence of my pdoc to be "drugs", and my responses were certainly "influenced." Sadly the effects were not positive for me.

In the early days of MDMA, before it was outlawed, there were many in the psych field who were encouraged by its effects, and actively utilizing it in therapy with much success.

However, I don't think that in the current climate it would be wise either to secretly be on it, nor to inquire with anyone in the psych field about doing so as I suspect it would very likely put strain on your therapy relationship. It's "illicit" now, grouped in with all kinds of truly terrible drugs, despite the therapeutic promise it showed. (And from what I understand, what's around nowadays is quite a bit "dirtier", mixed in with other drugs of origin that can only be known with access to a laboratory, and therefore could not be counted on for a purely MDMA experience as was once the case, when it first came into use decades ago.)

I'd be hesitant to bring it up even in a scientific context with a therapist, with their proclivity for analyzing and looking for hidden meaning.