will i still have to renew claim if review = F2F?

Hi,
I have M.E, had a horredous HP assessment when I first claimed PIP 2 years ago, went to tribunal zero points became 27, awarded until April 2018. Took months for my condition to stabilise.
Review forms arrived beginning of April. Big Shock as NOTHING on original award letter mentioning this could happen and under 18 months since won at tribunal. Filled in no change, used your advice gave additional info on everything tribunal had awarded and mentioned tribunal findings as much as possible. GP wrote another letter confirming no change in condition, no treatment for condition and no forseeable change as I have now been house and bed bound over 6 years.
Friday call from Capita, have to go to Swansea again for HP assessment. Refusing home visit, say none available, results in me on phone to GP prescribed diazepam and being offered antidepressants, as highly distressed, having suicidal thoughts etc when my only mental health problem is the DWP. GP writing letter to support need for home visit. Unlikely to get one anyway and am expecting same process as before, treated as lying scum and will be forced to Tribunal again.
Three specific questions:
1. If new HP assessment etc is done will I still have to renew my PIP application in 2018, or does this replace that process? Basically am I going to have to do this, and then do it all again come next spring? When partner asked DWP originally answer was unclear, along the lines of, this is to make sure there's no delay in your renewal, whilst also stating nothing to worry about??? ha ha ha.
2. as the DWP case manager had no evidence that my ability to function had altered, and GP letter confirmed the same, can I challenge the decsion to refer me to CAPITA or at least request under data protection they give me the record of their reasoning?
3. Although if I didn't have M.E I could logistically and intellectually manage this process, because of the sensitivity of my body to stress and my previous treatment I am becoming very ill just thinking about it all the time and running through what I need to do and say at tribunal etc etc. CAB are only advice service available in Carmarthenshire and they are useless, can't advocate at tribunal and refuse to quote caselaw when requested in my review and in my original tribunal. i'm wondering how a tribunal would view me employing a benefits lawyer or someone good to advocate for me at tribunal as I need to be able to hand this over to someone else for the sake of my health and my family's - all severely affected by my poor health. Suspect might get up tribunals nose, make me look suspious (yes I am paranoid now) and simply cost too much. Any thoughts?
Thank you.

Thanks Gordon. I have done the check, the only other service concluded my partner was intelligent enough to do it ourselves. Not really the point is it. Any idea how one finds a benefits lawyer or advocate who knows anything?