Rosie
I think it's totally up to you, you could go together with DH or one of you could go first.
You may need to ask about payment etc, whether your son is willing to pay for sessions or both contribute.
There are lots of counselling services that are means tested so you pay what you can afford. So it might be worth seeing what is available in the area.
You could also ask to see the councellor separately first, so you can talk through with them what you hope to achieve and ask questions about what to expect.
Another helpful thing for you is to keep a little diary about sessions so that if it is emotional at first you keep inimdanything you want to talk through in the next session.
Really rooting for you, hope things go well
Do you still have all your own teeth?
Have you read any good books lately?
Another Tired Kicking For The Sick And Disabled By Rishi