You bet you ass they can. It didn't take you 3 weeks to get to this point in life...so don't expect to be "better" in 3 weeks. Acute withdrawal is more complicated than many expect. Symptoms vary, while the body rids itself of the toxins and the brain begins to develop new neurological pathways. It's all good! Lots of V8 juice, B1 and folic acid (folate).
Be gèntle with yourself....PAWS is coming. But we're here for if and when that bridge comes . Hell.. it probably won't be very bad. Just a mild case of say "misplacing your keys".
Keep posting..are you in the January Newcomers Support Class?