As far as I know, as part of an Initial Assessment, school, HV etc are contacted as a matter of course.
The thinfg is it's an INITIAL assessment- that does not suggest any child protection concerns,
SW's have to complete their assessment within 7 days- what they SHOULD do is help plug you into any support services you may find useful- did the SW discuss this with you? If not, give thenm a ring, you're allowed to!!
I know it's scary, but please ask if they havn't explained themselves, they are supposed to, y'know, and it's bad practice to keep you in the dark.
Working with parents is supposed to be one of the cornerstones of practise with SWs.
Ring 'em up, try to overcome your nerves, say you don't ubnderstand what the procedure etc is- they HAVE to explain what's going on.
Hope you are ok, sorry you're feeling low. Hopefully they may come up with something USEFUL for you? (hopeful) x