Symptoms worsened but too scared to tell PIP

hiya everyone .... this is my first ever post so go easy on me 
Im currently getting PIP, on my last assessment they took away my higher mobility and gave me the lower even though I don’t feel it was justified. I didn’t have the fight in me, and I still don’t, but I didn’t appeal it, I gave in and made due... anyways over the last 6 months prob longer my symptoms have worsened. Worse than they were before they lowered my PIP. However I’m too scared to say anything in fear it will result in me losing more or all of my PIP as unfortunately they don’t always get these assessments right! ( understatement of the century eh!) I’m not sure what this post is meant to do for my situation, maybe I could get some advice on how to make sure that doesn’t happen? Does anyone else have these fears/thoughts/feelings? Thanks in advance to all that made it this far ??