I thought this might be a good post for pointers on how to quit meth/amphetamines and feel good after quitting. I'm not an expert, exactly, but I've found some things that worked well for me so I'll add them here. Hopefully this will be good help for others!
1. Take a week (preferably two) off work to spend in bed or around the house. You'll need it! Amphetamines deprive your body from getting enough sleep - even if you think you're getting enough sleep while on them, they take up so much energy from your body that you'll need extra sleep to recover, and I mean a LOT OF IT! When I detoxed from adderall I spent about 16 hours a day sleeping. You might wonder if you'll ever get out of bed again, but by the end of the week you'll find that you can spend at least eight or so hours awake - that means your body is finally getting back to normal. The important thing is to let yourself sleep AS MUCH AS POSSIBLE for the week or two that you have.
2. Eat a lot of healthy foods - with lots of protein, vitamins, etc. I know from experience that when you're withdrawing, the last thing you'll want to do is cook, so make sure that you have lots of foods on hand that are easy to eat right away - yogurt, hummus and raw veggies, fruit, prepared sandwiches and pasta salads, etc. Don't worry about eating full meals, just make sure you snack consistently while you're awake and eat as much as you can.
3. Stock up on vitamins and supplements to take during withdrawal and afterwards. The first week, take a lot of L-tyrosine (an amino acid that restores dopamine to the brain), a good multivitamin (preferably the "superfood" kind that has stuff like spirulina, chlorella, other herbs, etc.), protein powder, and vitamins/supplements that restore muscle tone (amphetamines weaken your muscles and that's why you'll feel shaky on your feet). Good medication to take during this first week are benzos (be careful with these, you don't want to start a second addiction, but one week of benzos should be fine), and meds for restful sleep such as seroquel.
The second week, continue your L-tyrosine but stop taking benzos and use seroquel, etc. more sparingly. You may start experiencing more depression or anxiety around this time, so supplements I'd recommend are valerian root or kava (for anxiety) and St. John's Wort (for depression... don't take it at the same time as tyrosine, though). For medication, I don't recommend SSRI's (unless they've worked well for you in the past), but I do recommend Welbutrin and others that work well on the dopamine system. For me, personally, Abilify works really well for depression.
Note: If you're going to try psych meds to help depression/anxiety systems, make sure you research any interactions with supplements such as L-tyrosine, etc.
4. After the end of the first week (or even second week - whenever you can get out of bed for more than a couple hours) you'll want to start EXERCISING A LOT! Your muscles will have been weakened from daily amphetamine use, so you need to work harder to build them back up so you can feel strong on your feet. I recommend short, intense exercising that won't take too much time, but will build your muscles up fast. Try eating a good, healthy meal, waiting an hour or so, and then going on a good run/bike ride/cardio at the gym for as long as you can (at least 15 minutes, but hopefully 1/2hr/45mins if you can do that). After the exercise, replenish your body with a good protein supplement plus a high-protein food (ie. yogurt, meat), wait about an hour or so and then have a nice long sleep to let your muscles rest. Do this EVERY DAY if possible.
5. After a couple weeks the worst will be over, so your job is now to keep yourself from relapsing. I recommend removing as much as stress as possible from your life and letting yourself take it easy as much as possible. Also, make sure that you're eating healthy and exercising as often as possible - keep that up! It'll make you feel good and that'll keep you from craving as much. L-tyrosine and the multi-vitamin are the minimum supplements that you should keep taking for the next few months or however long you need them. If you feel the need for a psychiatric medication, you may want to stay on Welbutrin, Abilify, or whatever antidepressant/anxiety med works well for you - stay on it for about 6 months to a year because these meds work best over a several-month duration (and some of them take about six weeks or so to kick in), then you can begin tapering off them.
Remember that a daily amphetamine habit has long term consequences and you'll need to take extra care of yourself for several months/a couple years after quitting. However, i can tell you from experience that if you take good care of yourself after you quit, you can begin to feel good about life QUITE SOON!