How to replace Esomeprazole Nexium or take a rest?

Hello, I have an 11 y/o son, he's epileptic and has cerebral Palsy. His neurologist said that he needs a permanent gastric protection because of the antiepileptics meds. So he's on treatment with Nexium since he was a baby and sometimes we take a little break, two or three days. Lately I noticed that he's been more anxious, started drooling excessively and has motility issues, and the new blood test the magnesium levels are too low. So before we go to see his doctor I'd like to know if anyone could suggest any other gastric protection better than Nexium, so I can discuss it with him in the next appointment. I usually do some research about the meds because my son had severe health issues due to side effects. Thanks in advance!!