I'm assuming that your epilepsy is well under control. It highly likely to face mood issues in those with epilepsy and most times, the medication u r on for epilepsy also help in control of your mood swings and make it stable
Next Steps
have a detailed consult with your neurologist and ask him/her to refer u to a psychiatrist for further evaluation
Health Tips
suicidal thoughts are dicey, but I'm happy u r seeking help.. try talking to someone u can trust