I presume that Restyl has been prescribed by your doctor. This is used to treat panic disorders and anxiety, like unexpected extreme fear and tension due to stress. Do not stop taking this medicine suddenly as it may cause withdrawal symptoms like seizures, aggressive behavior, blurred vision, etc. Some of the side effects are sleeplessness,  loss of appetite, Headache,  Difficulty in passing urine etc.  Best advised to go back to your doctor and he/she will be the right person to advise you with dosage adjustment or change of medication