It can fuck you up for sure, perhaps not due to neurotoxicity, but lets be objective here, how many people end up with long term mental health issues from drug use? Even a bad experience with marihuana, psychedelics or alcohol can trigger panic and anxiety disorders, depression, etc... we often here about not taking any psychoactive substances if you have a family history of schizophrenia, bipolar, etc... Well anxiety and depressive disorders can also be triggered easily by these substances, of course not cause them directly but trigger them if someone was predisposed, yes with MDMA there is a neurotoxic effect that could by itself cause mental health disorders such as anxiety and depressive disorders by itself without a predisposition but we are talking major abuse for neurotoxicity to reach such cognitive effects, im 100% sure that a single reasonably responsible dose of MDMA wasnt the culprit, perhaps if you were predisposed to these disorders because of genetics it could have triggered them but I doubt its direct involvement.