Basically, keep it natural, with no additives, preservatives, colors, or flavors. Know what is in them. Beward of taking Herbs, unless you really understand them, what you can and cannot take with them, and what their side effects are. Remember that herbs are medicines that the ancients used before medical science began developing them. You must be educated in their use, or you may get into trouble with your health.
Recommendation is also to use caution.
Remember that our bodies are not working normally, we do not synthesize chemicals properly, and we do not utilize chemicals sometimes the way the manufacturers intended them to be used by the normal person. No amount of a narcotic medication will completely take away the pain, it may dull it, or put you to sleep, so that you do not perceive the pain as much, but you pay for it with other side effects. There is No Miracle Drug to take away the pain, and cure the disease. Narcotics frequently interfere with Sleep, and we get precious little of the Stage 4 Deep Sleep as it is. Find a way for your mind to be quieted, so it can rest and relax.