I understand completely what you are going through. I have begun a regimen of microdosing Naltrexone which is a medication that is used to treat opioid addiction in large doses. It was discovered that, when the addicts began to wean themselves off of the drug, at a point where they were down to between 4.5mg and lower to just 2.5mg, their pain was very much improved. What the drug does at that low dose is to help the brain create more natural opioids that most people have to handle pain. After about a year, those natural opioids will become permanent. I have noticed a sharp decrease in the pain. I too have very tight muscles over my whole body which I've had for a long time and the usual physical therapies don't help. About a year ago, I started experiencing the internal tremors which every doctor diagnosed as anxiety. But it is not anxiety. It's that my muscle spasms are so strong, it has affected my nerves which are reacting to the tightness of my muscles. I can't take opioids nor can I take muscle relaxants. When I sit, the tremors are felt in my pelvic area. When I lie down to go to sleep at night, the tremors are unrelenting but there is no pain associated with them. I honestly don't know how to treat the tremors or if I can. If you haven't already, try going to an MD who specializes in homeopathic medicine. My MD is very understanding and was the one who prescribed the Naltrexone. He is also prescribing various supplements that might help with tremors. I hope you can find some relief.