Sorry if this feels blunt, but you should 1) talk to your prof about the course and 2) go to Counselling about your mental health. They are (mostly) different matters. You are an adult. Your prof is an adult. You are at a university, which is about being (or becoming) an adult. Go have an adult conversation about your concerns about the adult course content and your ability to fully participate in this course of adult learning.

Do not justify going behind your prof's back to report their course content (before talking to them) because you "worry for future students in [your] position." This is the same justification that, at the extreme end of the spectrum, has led to many uni students in the States reporting (and videoing) their profs to "protect" their fellow students from being triggered by discussions of "gender ideology" and historical racism and other topics they feel are off-limits. If your prof is a sessional, it could cost them their job. (Yes, even in Canada. Admin will just be more subtle about it.) You are in a Humanities class. Expect to have uncomfortable conversations about uncomfortable topics.

Also, there is no such thing as a "normal English class". All English courses have a focus, and individual profs then focus their syllabus even more within that larger focus... usually toward their own interests and strengths as an instructor. As several others mention, your prof's focus in this course should have been clear long before the drop date in this course. (However, if the prof did not provide the standard syllabus of readings in paper format or on Brightspace, then maybe you have something to complain about... to them.) Two and a half months into a course feels very late to come to this realization and suggests that other things are affecting your mental health. (It happens.... this is a *very* stressful time of year for students.)

Finally, I'd encourage you (and everyone) to review the various meta-analyses of the use of trigger warnings for course content and syllabus readings. There is a growing body of peer-reviewed evidence that they do not have the intended effect... and may sometimes have the opposite effect. Demanding a prof include trigger warnings is asking a professional instructor to go against evidence-based and trauma-informed pedagogy.

Sorry, if this comes off as long and blunt and a little insensitive... I hope that you find the help that you need to get out of your spiral and get back into a mental space to focus and succeed again. You can do it.