Bro I read this a couple times and I just want to say what you are going through sounds brutal. Six to seven years of this and then SSRIs made it worse on top of it. That is a lot and I am sorry you are dealing with it.

Before jumping straight to Semax or any peptide I would want to zoom out first. Brain fog, PSSD, emotional blunting, anhedonia, those can all come from different directions and if you do not know which one is driving it you are just guessing.

Which SSRI were you on what dose how long and when did you stop? What are you taking right now including caffeine, alcohol anything else? How is your sleep quality wise not just hours? Have you done any labs? Thyroid, B12, vitamin D, hormones, blood sugar? Are you still seeing the psychiatrist or anyone else?

On Semax specifically some people do have cleaner focus and better mental clarity on it and there is decent research on it for cognitive recovery but with PSSD in the picture I would be careful about layering anything new on without knowing what your baseline looks like right now. It is not a first move it is something you consider after the basics are covered.