oh dear me.
My husband had chronic depression before being diagnosed with PD and was on antidepressants, was offered help via his GP. Eventually got so bad referal to local mental health was made. etc etc
But once he was under the lovely parkinsons specialist things changed for the better. Sad to have to get diagnosed with PD to get mental health help.
He changed the antidepressants and just because he was listened to by somebody, husband improved no end and changed medication and is now so much better.
So sorry to hear about your troubles. Hopefully GP will ring you back. Else ring the Parkinsons helpline, these people are soooo helpful and friendly you will be glad to called them.
Please ring them for advise