Breathing techniques, hydrogen peroxyde and hyperbaric oxygen chamber are 3 methods of heavy metal detoxification that use oxygen as an end to a mean.

The oxydation of metals by oxygen help the break down of the undesired heavy metals for their quick release out of the body via regular means ( sweat, urine, bowel movements, tears, spit, ....)

It's possible to cry more while experiencing a body detox, as the body will use any form of excretion possible, regardless of the significance we human put into it....So cheer up your detox, you may cry your heavy metals away.