Hey there. I'm only going by your namesake, so, I'm sorry to hear that you're addicted to "Speed". Firstly, I'm gonna assume that your current drug of choice is Methamphetamine. If I'm mistaken, please let me know.
What you're experiencing is not uncommon when using stimulants. (Meth)Amphetamine has some pretty gnarly acute side effects. The good news is that the majority of them are just that, acute. The neurotoxic effects of the drugs will only come into play after chronic usage. The change in skin coloration could be due to circulation issues or dehydration or what have you, but should be temporary and will abate upon the CNS effects of Methamphetamine subsiding.
If you have any more issues, let us know, but you should be fine.