It is extremely unlikely that a 'cut' is causing the seizures. I do not know of any commonly used cuts (or any at all, really) that would induce seizures.
Seizures are not uncommon with cocaine use, and of all the commonly used stimulants, cocaine has the lowest seizure threshold (this means that it is easier and much more common to have a seizure with coke than with say, meth or MDMA). If you have tendencies to epilepsy/seizures, which seems quite likely considering your recent episodes, then you should DEFINITELY stop using cocaine immediately. I would also strongly suggest that you avoid all stimulants -- meth, MDA, 4-mehtylaminorex/ice (in particular), Ritalin, and MDMA (which is the least likely to cause seizures of all the stimulants).
If you choose to continue using stimulants (despite my warning), then please try to be very cautious about your use -- don't do that much, and don't do a whole lot all at one time, but rather space it out so that you dont overload your system. If your heart starts pounding uncomfortably or you begin twitching/having hand trembles/shakes -- then realize that you are entering dangerous territory, and DO NOT do any more coke that night.
Epilepsy is not a fun condition, and in most places your driving license will be taken suspended for at least 6 months. Furthermore, with each additional seizure, future seizures become much more likely.
So, PLEASE proceed with EXTREME caution if you would like to remain healthy and functional.
