I understand exactly where you are coming from, try talking to your GP, he/she has the authority to refer you for an appointment with the psychologist and psychiatrist without going through your nurse! You need to keeep a record of events , then talk to your nurses boss about your suspicions backing them up with the facts in your record of events. you may have to insist and quote your rights to talk to higher authorities, but it is worth the fight!
I had a similar thing with my social worker, she was a mean piece of work, she threatened me she would remove my blue badge, taxi card, direct payments which pay for my carer and my buss pass if i bought myself a mobility scooter out of my savings to enable me to leave my house on my own when my carer was not around!
she also has stuffed up my chances of ever getting my house adapted by adult services too! but by gathering evidence (i secretly recorded a meeting where she reitterated her threats and then i played it to her boss!) I was assigned another social worker. the new one is much better but the damage with adult services still remains and they refuse to adapt my home eventhough i have been totally wheelchair bound for 2 years!
you have to be as sneaky as they are to gain your evidence but once you have it things will get better.