Depression can often be assocaited with both epilepsy and stressful life events such as your recent hospitalization. It may be reactive in terms of relation to stress or a more persistent major depression. In any case, you should see a psychiatrist if nto already as short or long term treatment may be very beneficial for you, and result in a retuirn to normal. Common symptoms of depression include feeling of hoplessness, loss of interest in activities, suicidal thoughts, and physical symptoms also, such as early morning awakening and poor sleep, loss of energy and appetite, and constipation.
Intense flashbacks depending on what they consist of may be either related to the psychological stress oyu experienced. Sometimes intense 'experiences' can come from epileptuc seizures from the temporal or posterior temporal region of the brain. I don't know if this fits with your type of epilepsy, but it may be something for your doctor to look into ie an EEG or recording one of these experiences on EEG.
Good luck