Seventhcandle, unfortunately I have not found anything which stops it or significantly relieves it. I do think the Gabapentin slows the twitching down, but it makes me feel lethargic during the day. I have also tried GABA, a supplement, but I noted no improvement. Some people feel it helps them. I have tried liquid magnesium chloride, which for a few weeks made a slight improvement, but the fasciculations fell back into its old pattern of being without mercy.
I concur with you--Ambien makes the condition intesify--it is always worse a few days after I take it. I used to take Benadryl every night for about 4 years, then discovered it has antichlonergic effects. After I stopped it, I saw no improvement anyway.
You might try GABA , and see if it helps-- but for me it gave my nerves "crawling" sensations after taking it a few times, nor did it slow down the twitching. I definitely suggest taking magnesium in the evening or night; although limited, it helps me a little. I take 500 mg magnesium a couple hours before the Gabapentin, then I head off to bed. Some doctors will prescribe Gabapentin which is a narcotic (brand name Neurontin) for insomnia. For me, it is one of the few medications I have taken which has never made my twitching worse and it actually helps slow it down a bit. However, high doses can tax the liver-- I take milk thistle daily for detox. You would do well to have occassional labs with long term use of Gabapentin.
BFS appears to be a mystery with no known cause. I personally do not think it is an anxiety condition, there are some people who do think so. Too many factors like certain foods, preservatives, medications, etc. have proven to increase the fasciculations without stress being a factor. Ironically, the sheer agony of it produces stress--and stress no doubt makes it worse. Some people have a few twitches they feel during the day, for others, it persists day and night, sometimes long in duration!
I wish I had some helpful answers. I empathize with you and know too well what it feels like being sleep deprived all the time. I assume you have seen a neurologist. My neurologist prescribed Bacoflen, it only "masked" the twitching for me, yet it did make the condition more tolerable at times. Unfortunately I experienced rebound spasticity resulting in ballistic "deep" twitching after taking it on and off in a 6 month period. It also effected my labs and liver negatively. I do not think it is supposed to be used for long extended periods. He eventually prescribed Flexiril. I never took it because of its side effects, as well as antichlonergic qualities.
Have you tried Gabapentin? I am curious as to what your primary doctor or neurologist has suggested to you. I never tried l-theanine, and I will certainly steer clear of it since we have reacted to the same things! Another trigger I left out in my previous post is pectin--I noted every time I eat high pectin foods, the twitches increase in fervor and frequency within 24 to 48 hours. I hope some day a cure arises for this condition, and that it will be researched more extensively. It is not as harmless as some believe.