There is no commonly used verb that is equivalent to 'to pain'/'to ache' in Hindi.

दर्द is a noun. So, taken literally, the Hindi sentence 'मेरे कान में दर्द हो रहा है' would translate to something like ' Pain is happening in my ear'.

मेरे कान में = in my ear, दर्द हो रहा है = pain is happening.