I got warned for answering a similar topic so I'll moderate myself this time, but for the sake of access to information I'll do it. Dopamine overwrites everything, it's the primary mechanism. People suffering from extreme schizophrenia who have high levels of dopamine enjoy cutting their fingers off and even squishing in their eye balls to pulp, when asked why they did it, they answer that it felt amazing.
I don't care how terrible heroin withdrawals make you feel, a sufficient increase in dopamine can turn any discomfort into pleasure. It's just how the brain works, science says it, not KSA. I guess, the guidelines for harm reduction say not to use amphetamines to overcome opioid withdrawals, so in order to comply to forum guidelines my advice is not to use amphetamines, provided you have read and understood the above.
I'll compare H withdrawals to injecting naloxone. If the nervous system is activated by adrenaline and naloxone, the result is a suffering worse then Heroin withdrawal. However, if central adrenaline is lowered with clonidine or intuniv, and the nervous system is activated by naloxone and dopamine alone, dopamine will override naloxone's discomfort as pleasure, provided that adrenaline and serotonin do not increase too much. If serotonin also increases with dopamine and naloxone, the nervous system can overload and problems can occur. However, since serotonin decreases during withdrawals, before you have to worry about it getting too high, withdrawals would have been long gone.
However, if too much clonidine or intuniv is taken, and adrenaline drops too much while naloxone and dopamine increase greatly, the heart can stop due to a lack of signal from the brain. Then, an adrenaline injection to the heart would be required to restart the heart combined with cpr. So, while improving the withdrawal symptoms using methamphetamine is possible in combination with clonidine/intuniv, reducing adrenaline to the point of feeling dopamine euphoria will stop the heart, so in order to ensure your organs keep running, adrenaline should only be lowered to a point where you still feel a slight discomfort, because it is that discomfort that actually keeps the organs running properly during H withdrawal.
Measuring neurotransmitter levels can be done by drinking cold water and noticing what it feels like. If it feels like drinking shampoo or soapy water, leaving an overwhelming soap aftertaste, both adrenaline and serotonin are dangerously high. If it causes a painful aching in the mouth and throat to the point of discouraging you of having another glass, serotonin levels are normal and adrenaline levels are dangerously high. If you cannot feel the cold water in your mouth and throat despite it being cold, or you feel it as warm, adrenaline levels are dangerously low and you are close to death. Don't attempt anything on your own if you don't know what you're doing.