Will Oramorph Oral Solution help with breathing?

This depends on what you define as 'help' in this specific scenario.

Oromoph is an opiate - consisting of obviously, morphine.

If you have an excess of any type of opiate, you run the risk of respiratory depression.

Meaning, your respiratory rate may decrease. Some Palliative care professionals prescribe opiates specifically to decrease someone's respiratory rate, in the hope that it may make them more comfortable.