The efficacy, or otherwise, of counselling (for all types of things) has been discussed many times before on AB. It seems to be a 'Marmite' thing, with some AB members saying that they found it to be a total waste of time but with others reporting that it helped them greatly.
I suggest trying a phone call to the Cruse Helpline. (Their lines are open from 9.30am to 8pm tomorrow. See the link for times on other days: 0808 808 1677). You'll then be able to have an initial chat with someone who understands how you're feeling and who might be able to suggest the best way forward for you.
https://www.cruse.org.uk/
An alternative (or additional) helpline you might like to call is that of The Compassionate Friends, which is a charity dedicated specifically to supporting bereaved parents. Their phone lines are open from 1000 to 1600, and from 1900 to 2200, every day of the year.
https://www.tcf.org.uk/
See also 'Things you can try to help with bereavement, grief and loss' on the NHS website:
https://www.nhs.uk/mental-health/feelings-symptoms-behaviours/feelings-and-symptoms/grief-bereavement-loss/