Hi Jenny, I’m so sorry to hear that your dad has died of Covid-19 and that this has triggered your pre-existing mental health problems. Losing someone through this virus can certainly be a trauma. It sounds as though you have a good understanding of your own symptoms and it’s good that you have a counsellor and are already trying strategies to cope. I’m not an expert, but they sound very sensible to me, and many of them are often suggested by others on this site. Hopefully you will soon get more replies from other bereaved people with their own perspectives - you are among people who understand here.
We have had two other new users join in the last few days who have lost a parent to Covid-19, so you are not alone:
@Tracew posted here: Have lost my beautiful mum
@Berry posted here: Lost my mum yesterday
@Jobar has also posted recently about traumatic bereavement, although the details of her loss are different: Trauma counselling