speaking from experience, YES, there is a definite connection between taking both these drugs - one, the other, and ESPECIALLY combined - and the condition known as 'memory loss.' Benzos slow you down just like booze and will black one out as per dosage size;, and when you're high on meth you're invariably taking much, much higher dosages that you would even tolerate sober. So that explains that. i've blacked out too many times in broad daylight just from combining the two, coming to my senses hours into a day halfway started, my shoes mismatching, attentively engaged in supposedly meaning conversation with friends, coworkers, customers....real cool stuff
Now doing meth just itself will just rot your brain, and this knowledge is uqiquitous and incontrovertible. you can spend days reading medical studies on the subject. and most brain damage brings the effect of memory loss. So what youre experiencing is normal for a drug user. It just gets worse