My son having bad side effects on his meds.

I have a 26 year old son who is on to 250 mg Xcopri, 100 mg Vimpat, and 10 mg Lexapro. The side effects are very tired, memory loss, blurred vision. anxiety and depression . We’ve tried numerous medications for almost two years. similar side effects. planning to get in the hospital EEG,To locate and find what type of seizure he has. anybody had any luck in finding the right medication‘s ,or solutions to their problem after this procedure?