Amphetamines can turn off emotions, or sometimes exaggerate them. You might want to talk to your doctor about trying different kinds or try methylphenidate. It’s know phenomenon that many people only do well one particular kind of stimulant and react badly to others.
Or dosage might be too high. Why is there a plan to increase in a few weeks? That shouldn’t be decided until the current dose has been tried out and determined to be not effective.