I injected test e at .4 ml twice in the past 4 days and each time my left foot started tingling a little bit. Not looking for any smartass comments but some genuine help/answers. Anyone have any insight on heavy metal poisoning from gear
This sounds like a little like you hit a nerve. I've only done this once in my quad and was maybe the most painful thing I've experienced while pinning. I would entirely throw out the notion this has anything to do with metals in your gear or poisonings of any kind. At worst you had an adverse reaction to the concentration of the gear, the suspension used (GSO/MCT/MIG).
There is quite a bit of missing context from your initial question but I highly suspect this was just hitting a nerve. Try switching injection sites(other glute, perhaps?) or altering the position of your next pin if you insist on staying with how you did it last time.