This. OP your abrupt tolerance is only temporary and will go away after discontinuing the medication and getting 3 consecutive nights of 7h sleep.
As you skip consecutive nights on amphetamines, you begin to lose the memory center and learning new things can be a major challenge. It's a bit like living on the first floor of a building your entire life and then suddenly moving to the second floor, then the third floor, you sort of forget what life used to be like on the first floor and stop worrying about life matters that are relevant there. The higher you go, the more amphetamine it takes to not only maintain you there but also to get you to a higher floor. You only perceive the high as moving up one floor and you forget how high you've arrived.
To test this you can try to perform a complex calculation or to remember something and say it an hour later, you will be unable to if you are in such a state. Also, if you are in such a state, waking up after a nap will be very disorienting for 1 or 2 minutes, after which it all comes back to you. These are important clues in order to determine if your tolerance is legitimate (likely not) or if you've just gone temporarily insane because you took too much without any deep sleep.
Skipping nights and not getting any deep sleep is for many the only way to a true amphetamine high, since deep sleep sort of ruins it with vasodilation and other mechanisms, so you're not doing anything wrong by skipping nights, what you're doing wrong is that you have an incorrect assessment of your situation, of where you stand, what you're trying to get on the second or third floor that you can't get on the first, and for how long.
Also, when you reach material balance, meaning when your body begins to eat its own muscles and fattie tissue to survive due to lack of food intake, the sensations you get will be dulled and will take more time to arrive. This again can be mis-perceived as tolerance. In this scenario, eating a healthy meal will restore all sensations, as if you had taken many amphetamine pills. Food cannot contain 5-HTP in this scenario or it may not be a good idea to eat it.