Once I met a man who had cancer.
He lived in a flatshare with other cancer patients and when I told him that cannabis can help him he told me that his doctor never told him about it.
Today I want to tell you and @karenb54 about ketamine because likely your doctor didn't tell you about it. Why? I guess they have different reasons. They don't know, do not want to know, they fear to be judged by collegues, they want to save money, or have a perverted pleasure in seeing you suffer. Good that there is the Internet so I can tell you about it.
When people have pain where the reason is unknown it can be that neurons are firing wrong. They are little things that transport signals electrically and chemically and sometimes they go out of tact. Ketamine can reset them and make them work properly again.
I am not a doctor but read a lot about all sorts of drugs. That doctors prescribe opioids which do not work in all cases of pain and let the patients have incredible suffering is outrageous. A monitored application of the substance for 3 days can heal around 80% of these cases where the patients feel like their skin is burning et cetera.
But a controlled 2-5 day coma with breathing support is not always necessary. It also helps immediately after taking it. Depression goes away. People are pain free at least for a while and get new hope.
There is only one doctor in Germany, Dr. Kiefer in Tübingen, who works with it. Just like LSD, DMT and cannabis have suffered from propaganda against it by a certain group of people and companies ketamine had the same fate.
Most readers might have heard that it is a horse tranquilizer. What it really is, well, is difficult to say. To me it seems like it is life itself or a part of it. A good angel or a spirit which helps us to recover from pain and other problems.
It was discovered in 1962. It is on the World Health Organization's List of Essential Medicines, the most effective and safe medicines needed in a health system. It is used by psychonauts in sub-anaesthetic doses for the most incredible experiences because it kind of powers down the senses and then gives the brain capacity to experience our reality in a different way. John C. Lilly is a pioneer in this field: http://www.johnclilly.com
The brilliance of the experience is very difficult up to not explainable at all to anyone who didn't try it. Some people believe to know everything about reality but actually have no clue at all. Don't follow them. They pretend to be informed by being authoritarian or any other way to fool you. Believe in yourself.
Therapies cost around 1000 dollars depending where you are. A self-administration is possible but dangerous when the person doesn't have experience. Always try with the lowest possible dose (threshold) to find out if you have an allergy or any other problems. Do not mix any other drugs with it (alcohol and coffee are drugs). Have a helper who can call the emergency and do not eat at least 6 hous before. Also don't drink and go to the toilet before doing it.
Best is to do it legally. Because of legal reasons I am not recommending this to anyone and at the same time have to say that there is no other substance I know of which has the oustandingly phenomenal properties of a molecule someone called ketamine.
Edit: Typo