There's a few things I can think of...
+ Nicotine, like cigarettes or e-cigs.
+ Caffeine, especially energy drinks or energy shots.
+ Prescription amphetamines, such as Dexedrine or Adderall.
+ Sugary carbohydrate food like pure sugar, candy, soda, etc.
Those are pretty much the only real options that I've found for being able to muster yourself to do anything during the withdrawal phase.
Aside from that, the best thing to do is to eat and drink a proper diet, like get protein, fat, fibre, all the micro-nutrients (especially stuff like zinc, magnesium, vitamin b's, c, calcium, etc), then sleeping as much as possible (not unheard of to sleep like 16 hours a night for a week).
If you eat good and sleep as much as possible, you will end the withdrawal period quicker. After that, exercising frequently like lots of cardio and strength-training exercise regularly plus a diet high in calories and nutrition will lead you to having far more baseline energy, so if you do start using meth again, the crash won't be nearly as brutal.
The real problem is that a lot of tweakers end up laying around not eating or doing anything physical while high, so the crash is not just coming down, but also needing to recover from inactivity and basically starvation.
You can totally change the experience if you are regularly eating right and active and you do speed, as it goes from making you uber relaxed and sitting still for hours, to super-charging energy in a different way.
Aside from that, regular use of other stimulants can help tide you over between binges. There's things like benzos, 5-htp, and various supplements like magnesium, kava kava, etc, that can be used to treat the psychological aspects of the withdrawal (although benzos really help with the twitching and stiffness).