All of my answers are still the same regarding ginseng - as you may be finding there are few completely fixed rules in properly applied Chinese Medicine. There are many people who should not take ginseng for many clinical reasons, and in those women who do not need it, it could interrupt milk supply by overstimulating their adrenal system primarily.
As for heavy metals, you simply have to know where your formulas are coming from. All US suppliers test the raw materials before producing the formulas and most other major Chinese suppliers have similar controls in place. Compared with our general food supply, the “risk” is no worse and no better. Chinese herbs are used safely around the world in very high numbers with very limited accounts of actual toxicity - and most of those accounts would likely be in people who are self diagnosing and/or using herbs from poor suppliers. If you need a particular formula in a diagnostic sense, then it is good to take it and will not cause problems, just taking things because they seem right is likely to be not effective.
If you never had these issues before having nespresso coffee, don’t have nespresso coffee. While it could be the plastic, etc. it is more than likely due to an increase in caffeine.
Above all, I would suggest, as previously, that you consult with a practitioner in your area and receive a proper diagnosis of the underlying causes and more direct recommendations.