I would usually get 24-36 hours from ceasing a run on meth before I would start feeling withdrawal/comedown effects.
Usually the first time you comedown from meth is the worst. You can expect anxiety, depression, and your emotions all over the place. No matter how bad you feel keep reminding yourself the worst of it is over in 48 hours. Most likely you’ll just stay in bed for two days telling yourself you’ll never use the filthy stuff again!
Anxiety can often feel like a heart problem.
Make sure you keep really well hydrated, for yourself to eat quality foods, especially leafy greens and take plenty of multivitamins and plenty of vitamin C (which speeds up excreting meth from your system).
You have benzos right? Try and stay awake during normal waking hours and the. Use your benzos at normal sleep time to try and reconnect to your normal sleep cycle.
After 48 hours get up and start some light exercise and get out of your house for a bit no matter how bad you feel. Even if it’s only a walk around the block.