Focal epilepsy/ tonic

[Klt84]

Hi juat looking if someone can help. I have a child who has autism with a learning disability, who had a full tonic clonic seziure lasting 10 mins in 2017. Since them he hasn't had a tonic but was having episodes of zoning out and eyes flickering & fingers which only lasted a short while, all his legs kept coming back normal. Till his last one in March which showed epilepsy in the right front temporal region, they also did a MRI scan which showed a cavernoma. After having these tests he had another tonic seziure, which we have now started medication latramogine. He has had 2 seziures we're he has zoned out eyes fixed wide watering, constant swallowing as if going to be sick, with loads of fluid coming out of his mouth with his arm and leg twitching. I'm all new to focal seziures (&also a fightend mam) he is not able to explain things to me with how he is feeling apart from dizzy & sick & seeing bright colours due to the learning disability. I'm wondering if anyone can give me a little more information on focal epilepsy please. Thank you