A lot of people do find grief counselling helpful - it can’t take away your loss, but it gives you an outlet for your emotions with a neutral person and a chance to process your feelings. It may help you to understand how your grief is interacting with your existing mental health problems.
Please don’t feel that you should just be getting on with it. There is no timeline on grief and everyone is different, but in general it does take a lot longer than people think to come to terms with it.
There have been some other recent conversations on this site where people have talked about their experiences of counselling - perhaps it might help to have a read?
You don’t have to be suicidal to ring the Samaritans, by the way, and they do have the advantage of being there 24/7.