>I've also been worrying about how long the medication will continue to last.
Oh, Haruhi, man, I know that feeling. That's one of the worst feelings in the world. There's no real cure to it, other than to re-dose, which is a shitty idea that I can't recommend - It leads to tolerance and dependence, and maybe even addiction a little later on. You always end up wondering "It's still going, I wouldn't be wondering if it was still active if it wasn't still going, right?", correct?
You can also take Tums or baking soda with your pill, and that gives it a nice boost - I remember reading somewhere that it would give it a push to about 45-93% of it's original dosage, depending on tolerance, and when I tried it out myself, it worked pretty damn well. Most reports are contradictory with this, though, so I don't know if it's a placebo, or what, but I know what happened in my case - It worked 500x better than it did normally, and I didn't take my Vyvanse without at least a little baking soda. It tastes nasty at first (you're drinking salt water, basically), but it's worth it, in my opinion. Just don't dick around and just pour it down your throat as quickly as possible. A shot glass-sized mixture should do, with about a bottle-cap sized amount of baking soda. Don't go around drinking entire bottles or mugs of baking soda, man.
It lasts around 6-9 hours, too, more than double most of the other ADD medications, if that's any consolation - 12 hours if you're lucky, and/or boosted your dose with baking soda, but that also depends on the dose, you know?
What dosage are you prescribed? I got 40mg way back when. It was satisfactory, I'd say. I just couldn't pinpoint why I felt so good whenever I took my medicine. Only con was the lack of appetite and sleep, and the fact that the effects seemed to "ghost" well into the day - That is, I still felt the effects through some kind of strange mixture of willpower and stupidity (it was more or less placebo). I'd recommend a higher dosage, or at least try the baking soda trick; It worked for me, it should work for you - Although everybody's different. You might be deathly allergic to baking soda, or something I don't know is preventing you from accessing it. That's cool, too, man, I get it.
Vyvanse is fun. But that crash isn't so fun, to say the least. You can try and make it softer by doing things you like (haha, oh, man, but don't fap, though; It will be useless, and will do nothing but make you stay up longer, and feel like a masturbating zombie instead of a regular zombie), but the only thing that really helps are benzodiazepines, and I doubt you can get prescribed those (or would want to - benzo withdrawals are worse than heroin to some people).
Warm milk always helped me, in my case. With some warm milk, some melatonin, and a little bit of luck, I'd be asleep for school the next day.
Yeah, Vyvanse cannot kill you, for the same reason you can't snort it - The lysine group in the lis-dexamfetamine that Vyvanse is. You need to metabolize it through your liver, because it's binding the dextroamphetamine (the good shit), and you can't reach the lethal-dose faster than your liver can metabolize the pills. That doesn't mean your heart can't give out or something before you get to the "ultimate high" that hitting the ceiling dose is (400mg of Vyvanse; way too Haruhi damn much for your heart and you to still have the same relationship afterwards, if you don't die; That's 6x the highest possible dosage). That lysine group is one of the reasons it has such a low abuse potential, and that doctors are more liable to prescribe it.
I'll kakusu to be polite; You guys don't need to read my strange, stimulant-induced ramblings if you don't want to, nor should you be forced to, frankly.