Depression after loss

Haven't felt this low since the death of my son in 2017, I lost him just after he was born. Well just recently I've hit rock bottom again. I feel like I never grieved properly for my son. I constantly think about what could of been if things have been different and would do anything to have my son back. I called in sick at work today and have got a doctors appointment later on today to see what the options are. I never call in sick at work but I'm worried they will think bad of me.