I agree with all the choices made but I wanted to add for Q.8. Lithium has tendency to cause NEPHROGENIC Diabetes Insipidous which in turn leads to HYPERnatremia which might have provoked the seizure. As for Q.6 the hypertensive crisis was the result of un opposed anticholinergic activity.8-C, I think. Note that the patient had mania so you wouldn't expect her to be on bupropion and instead you need a mood stabilizer like Li, valproate or some antipsychotic. Convulsions and nystagmus are signs of Li toxicity. HypoNa (likely due to exercise) would increase the risk of Li toxicity.
6-E. I got this wrong (I picked C first) but turned out Benadryl can cause hypertensive crisis with MAO-I. Maybe due to it's anticholinergic properties?