Elvanse/Vyvanse – empty stomach or after breakfast? + lasting only 3 hrs?

Hey, I’ve been titrating Elvanse for a while. I’m on 60mg now. Still only works for about 3 hours, then I crash hard — brain fog, can’t focus, feel useless for the rest of the day.

Tried methylphenidate before, but it made me emotionally flat.

I have exams this week and it’s so frustrating that I only get 3 good hours.

I live in Germany where max dose is 70mg here. I asked my doctor what if this still doesn’t work and she basically said “not many options.” Mentioned a booster dose and she dismissed it, saying it might affect sleep.

Main question: should I take Elvanse on an empty stomach or after breakfast? Getting mixed info and I just want to know what’s worked for others.

Thanks