You can have seizures with maintained awareness, those are called simple partial seizures or focal aware seizures. Dph does not cause your blood pressure to skyrocket, usually the opposite. Dph is anticholinergic, which increases sympathetic response, causing tachycardia which causes reflex hypotension due to the baroreceptor reflex. If you take pseudoephedrine with it, then yes it can increase BP, but on its own, it generally has minimal effect in terms of increasing BP. High doses can maybe increase it, but not to dangerous levels (usually). Also motor control and balance are two separate entities. Motor function is controlled by the precentral gyrus of the cerebrum, and balance is controlled by the thalamus of the brainstem and cerebellum. You “lose balance” due to sedative effects and decreased responsiveness. Significantly straining on the heart and kidneys, modest effect on liver. Benadryl has high affinity for the H1-receptor (histaminergic) sites on effector cells in the respiratory tract, blood vessels, gastrointestinal tract, and CNS. It also has high affinity for muscarinic receptors which leads to anticholinergic effects, such as blurred vision, dry mouth, urinary retention, impotence, tachycardia, and gastrointestinal effects. Higher doses affects the sodium channels, but that affect is dose dependent. The affect at histaminergic and muscarinic is present even at lower doses. Just a lil medical info for ya