Grief can be forever but it changes form. That distinction is important to realize. It does not stay in the same intensity and is ever evolving. There is nothing wrong with a person that continues grieving, it is normal. We need help through this grief and that is important to recognize. Claribassist13 brought up the changes in our brain when we're hit with deep grief that can bring on a need for antidepressants when it has been altered. I was not depressed before losing George. Whatever depressive symptoms I've had since are due to the grief but neither do I feel the need for an antidepressant, nor do I think it would change anything. In my case, I've needed to get used to the changes this has wrought in my life and learn to accept and create a life I can live with, one with purpose and meaning. It has been up to me to make that effort and affect change in my life. That does not mean the next person doesn't need antidepressants! That does not mean the next person's brain chemistry hasn't changed. It IS important to see your doctor and keep them appraised of what is going on inside of you (that's what their questionnaires are for). Bet that as it may, doctors are not required to have degrees in thanatology (death, dying and bereavement). I'm not here to argue the point either, but do want these clarifications made as people here are in a vulnerable state. I'm not sure if you read the links posted by Marty, but I did, they were good.
I've always advocated going to a doctor and seeing a professional grief counselor (not all counselors are qualified). Again, I wish doctors and grief counselors could work together and at least have a discussion before something gets prescribed that may or may not be right for the person.
I found this to be a good article (to do with this subject from a different angle) https://onbeing.org/blog/courtney-martin-the-gifts-we-give-the-gifts-we-are/