You do not have to consent to internal examinations. They can care for you without them.
If they try to pressure you or force you then that's assault. Consent is only legally valid if it is freely given without pressure being applied.
If they aren't listening when you say no, then you keep repeating "I do not consent" firmly again and again and again until they back off. If they try to go ahead then you repeat it louder.
Usually those are the words that trigger the coercive/abusive staff to remember that what they're doing is unlawful and they stop. When you just say "no" or try explaining those individuals zone you out. "I do not consent" repeated if necessary is what gets through.
It will also attract the attention of non-coercive staff if you get to the point where you are having to repeat it with your voice raised. They can then make sure you are being cared for in a non-abusive way.
Do not be afraid to do this. It is not rude - trying to force and coerce and pressure you into an examination is abusive and criminal. Protecting yourself is completely fine.
If they pressure you into examinations you don't consent to they are committing a criminal offence and all healthcare professionals know this. They know this.
"I do not consent."
You don't deserve to be traumatised and it is not necessary for you to try and endure being traumatised. 