PIP Assessment last February. Things have changed

Hi, am new to the forum so please tell me if I get a bit lost on here. Basically, what I need to know is if I should get back in touch with dwp because my circumstances have changed. I'm a bit worried about it in case they drop my PIP altogether. I wasn't too pleased with the results from the assessment even though I got standard rate daily living and mobility because I thought the assessor did not take me seriously about my forgetfulness and she just told me to get an alziemers test. I got the impression that because she suffered from the same illness as me, fibromyalgia, and she worked then I should too. But everyones illness is personal to them. Anyway at the time I was assessed for fibromyalgia and asthma and mild arrythmia. Since then the fibro has got worse and am on much stronger meds, I've had mri and have 2 bulging discs top and bottom of spine, been diagnosed with essential tremor and am under the care of the memory clinic, still having tests but looks like moderate cognitive impairment due to a tbi a couple of years ago. Will I need another assessment or will they just accept new info. The thought of going through assessment again is stressing me out and putting me off.

I'm definately more limited now, I daren't go out on my own anymore for fear of blacking out, or getting confused and lost. Also, I can't cook because I forget to switch cooker off, burn things etc. Maybe I should ask my doc what she thinks? Thanks for the swift response.