If they want a health plan, why did they say they want the child to have a follow-up with a neurologist? The doctor isn't going to write a plan - they are going to give them clearance to attend school (just like the ER docs did). If the school wants a health plan, they need to say that.
Things need to be in writing so everyone is on the same page with understanding what's needed for the medical suspension to end.
Common sense says that the prescribing doctor is who should come up with a plan if this is due to a side effect of a med. (My feeling is schools are short on common sense in some situations. I've seen this with my own child.)