Treatments and drugs. Most cases of hiccups go away on their own without medical treatment. If an underlying medical condition is causing your hiccups, treatment of that illness may eliminate the hiccups. The following treatments may be considered for hiccups that have lasted longer than two days.
Poetry that overtly uses the effects of metre, rhyme and form, especially the fixed forms (sonnets, villanelles etc) is known as formal verse.
At its strictest, iambic pentameter is just as rigid as you've described. Poetry is a dactyl (X-/-/), not an iamb (/-X), hence it shouldn't fit anywhere in an iamb-only sequence.