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I am in a similar situation as you and trying to figure out the best way to take my medication. I never really thought about my psyllium husks having an effect, so I'm very curious what you've noticed

From what I read it doesn't seem like a good idea to take psyllium husk together with other medications. They seem to recommend one hour or two of interval between it and other meds. I don't know if it's just doctors being cautious, though.

I usually take Vyvanse just by itself at around 7AM just before walking to the gym, so I guess I associate the effect kicking in to my walking back home. On the days I ate something together with it, or specially with Psyllium, I notice a diminished effect

That's normal. Fibre slows down the absorption of everything.

Then what?

OP had no time to talk he was running for the bathroom.

Stimulant + laxative = ICBM (immediately coming bowel movement)