im on pip partner just died job centre say i need to start looking for work and get sick notes

hi my partner passed away 2 weeks ago. i am on enhanced pip for care and mobility. when i was on job seekers years ago i was on ESA because of health problems. now am far worse. it got cancelled because not enough tax or insurance paid so it got stopped. im not entitled to uc because no rent or mortgage as partner paid mortgage off. only disability allowed but i have to prove it. im under neurosurgeons and lots of other professionals with different illnesses. can they do this. im worried tests they do going to make my neck and spine worse after my 2 operations, and im still not right. been told can be upto 8 operations and still may not work.