This is really simple - Punch the tech in the mouth, then complain the tech hurt your fist.
As a Dialysis patient you do have one weapon at your disposal: you suddenly let your bandages slip at the end of treatment and bleed all over her. Try to get some in her eye. Then mention the antibiotics you've been on for this terrible, itchy rash you can't seem to get rid of.She'll never speak or come near you again.