I hope you have the time and the resources to keep it going. It reduces the activity of nerves by causing opening of chloride channels. Drugs that work at the GABA receptor complex, including drugs like Valium, can inhibit memory. However, at commonly used levels of sodium valproate, it does not appear that this is the major way sodium valproate works. Sodium valproate also has many other effects on nerves, including the ability to prevent them from firing too rapidly.
Any antiepileptic drug can cause cognitive or memory impairment and sedation.
These side effects vary from person to person. Although sodium valproate is a well established therapy for myoclonic seizures, there may be other alternative medications for you. You should discuss this with your physician.