My apologies for my delayed response. To answer your question, yes it has been very beneficial for me. Since using cannabis for the past five years I have not experienced completely disability fatigue, which you cleverly referred to as tsunami-ilke fatigue. I had not heard that term to desribe that overwhelming fatigue. Many times I laid on my floor after a fall, unable to do much more than breathe. Since I've chosen to use cannabis as one of two DMTs that have managed to keep me going in my wheelchair with enough energy to get through the day and enable me to stay up till midnight.
Having tried Copaxone years ago, with no benefit. Ocrevus, which I discontinued after battling several infections due to the lack of B.cells in my compromised immune system. Neither of these meds produced any noticeable changes in my condition. My experience with sativa strains of cannabis used in small doses bring me physical energy when normally I would be out.