the major problem with meth is you don't sleep for 24-36hrs after dosage, which regular amp is not the case.
if your still sleeping aqeuately, and not over stressed/worked, theres shouldn't be major problems, but once you stop you will feel worse... one of the first anti-depressants used was amphetamines! but then they realised its too addictive as in, virtually impossible to come off and return to normal. esp after 10 or 20 yrs. our neuroplasticity means your brain has adapted to this little kick.
but on another note, who takes only 10mg of dex? you must be probably prescribed 60mg, 20mg 3x a day no?
so your probably selling the other dexies to buy your gas? just a thought.