I've been taking ADs for a while now and was getting on really well with them (a generic brand). I got a new prescription a couple of weeks ago and noticed I've been given another brand generic instead. I'm now taking one bigger pill instead of 2 small. It's been making me feel pretty bad - jittery and anxious. Does anyone know how I can switch back to the original brand? Maybe if I ask for my medication in the smaller pills, so I'm taking 2 of them? Is it the doctor or chemist that would sort this out?