I'm on a very low dose of lisdexamfetamine and i freaking haaaaate missing a dose. As I understand it, it is a precursor of dextroamphetamine and your body converts it into it slowly through a metabolic-like process-- so pretty similar to XR but less of a saw-tooth curve throughout the day and more of a single sine curve.
I wouldn't call it a nightmare, but it sometimes feels like one. It is really a miracle drug for me in terms of letting me let myself comply to external demands on my attention and order my life.
I'm not trying to minimize your experience. I'm just trying to provide a more accurate framework on what's more statistically likely to occur within a population. That's all. Since others tend to be ignorant of the scientific facts on how this issue distributes among a population.