It's going to be really difficult (if not impossible) to provide you with a concrete answer to your question, as there are too many variables and confounds to consider; these pertinently include age, duration of benzodiazepine treatment, individual response to GABAergic/BZD-type substances, and baseline glutamate activity/relative predisposition to seizure activity. But based on my experience - both as a decade-long user of benzodiazepines and as someone who has, in that time period, both successfully and unsuccessfully tapered downward, a decrease from 35mg of diazepam to 10mg per day within seven days is not reasonably safe. You may be fortunate in the realm of seizure activity, owing largely to diazepam/desmethyldiazepam's ridiculously long half-lives, supplemented by their lipid solubility. However, I cannot tell you with certainty whether or not such a drastic decrease in such a short amount of time would decrease your seizure threshold to the extent that you'd experience a seizure. It's
unlikely - given half-lives and the fact that you'd still be on an appreciable (10mg) amount of diazepam. I'm not going to recommend it, though.
I will say that I can almost guarantee some pretty severe acute withdrawal symptoms resulting from such a leap downwards. I'm not clear as to why your time-frame for tapering down is so small, but it's a clear indicator of a pretty miserable experience in the making. All the classical BZD-withdrawal symptoms will be present - inconsistent degrees of restlessness/anxiety, some level of insomnia and very likely irritability and mood dysregulation. In addition, regardless of to what extent, your seizure threshold will have diminished and thus you would be especially wise to avoid
any stimulant-type drugs, including caffeine and nicotine. If you smoke, you'd have to take into consideration that nicotine lowers the amount of a given BZD circulating in the bloodstream. The implications of this become more clear when you consider that the mere 10mg of diazepam you'd still be on, if indeed it is just this 10mg that is buoying your body above seizing, would be even less effective in keeping your electrophysiology in check.
Do you take any other medications, herbs or supplements that affect dopamine, noradrenaline (norepinephrine), GABA or glutamate?
I'm assuming, based off your question, that you understand the relative dangers of long-term benzodiazepine use and abrupt cessation or rapid downward tapering, but the situation warrants re-emphasizing that tapering down from benzodiazepines is a very tricky, often touch-and-go, individualized process. To give you any type of "go for it" or "definitely don't consider this" would be stepping out of bounds. Given the nature of our community and its "harm reduction" taproot, however, I'm going to go ahead and strongly suggest that you
do not attempt to do this, especially without the guidance of a physician. BL can't substitute for the watchful eye of a medical professional who is directly observing you and interacting with your situation in real-world circumstances! Be safe
On a final and personal note, it took me eleven months to taper from 40mg of diazepam down to 2.5mg after (then) seven years of using BZD's daily (medicated, not abuse), and that was 11 months of pretty intense discomfort despite abiding by physician's directions.... Referring to my first sentence, there are a
ton of confounding variables that might have predisposed me to a less-tolerable medication reduction, but it certainly doesn't weaken my feeling that this would be an unhealthy decision for you.
Keep us updated if you choose to to undertake the proposed taper schedule...
~ vaya