Hi, welcome to the forum!
I don't want to put myself into the postion of a qualified doctor, but I do want to encourage your strength in working out any issues all by yourself, without neurotoxic "doctor drugs".
SSRI's lowering the efficacy of psychedelics is common knowledge. However, nothing is ever truly wasted. You gained an experience.
I hope that simple things, like breathing excercises will help you reduce stress. Always remember that even if your brains are stressed out to the max, you may find deep relaxation in your belly.