Alsithi
I would start by speaking to your GP about the support they can provide you. Your consultants should have written to your GP after each appointment, these letters will be in your medical records at your Surgery.
You can't say "no change" on the ESA50 as it's very likely that those assessing you will not have any access to any of your previous forms and evidence, so they won't know what you said previously.
You need to complete the ESA50 in detail and provide evidence as you can, even if it has been sent before.
Use our ESA Claim guides to help you complete the form
www.benefitsandwork.co.uk/help-for-claimants/esa1 If you have any specific questions then please reply to this post.
Gordon