What is the ruling on a female student becoming attached to her teacher, despite her attempts to avoid his gaze and her being affected by it, knowing the impermissibility of such, and what is the way to get rid of these feelings?

The reason for your suffering is transgressing the limits set by Allah and not adhering to the teachings of the religion. You must sincerely repent from casting your gaze upon this foreign teacher, for a woman's gaze at a non-mahram (definition) man in a way that leads to temptation is prohibited. You should occupy yourself with worship and strive in obedience, for when the heart is filled with the love of Allah, there will be no room for such false love. Infatuation is one of the most dangerous diseases, so seek refuge with Allah from it and seek Allah's help in repelling it. The aversion to mixing that has occurred within you is good, so praise Allah for it and strive to block the means to temptation.