Thank you for your email. The depth of your understanding and description of the symptoms show how difficult this is for you to cope with. You question is an important one and I am glad you’ve asked it.
Rather than think about a depression as circumstantial or chronic it is often a good idea to think in terms of frequency and intensity. From your description, the frequency and intensity have been increasing. This distress alone is worth looking into treatment. Since you are at the university I would make an appointment with the counseling center. The individuals there are well-trained on evaluating the situation of students and, more importantly, what the best approaches are for treatment. I would highly recommend making the connection to the counselor now and see if you can get some relief as you are finishing up your studies. As you transition the counseling can provide a support base by which you can make your decision about the symptoms improving as your circumstance improves.