Hi GeeJay
Welcome to the forum.
You might want to have a look at the following FAQ which explains where everything is;
www.benefitsandwork.co.uk/guides-for-claimants/faq/forum.
Ns ESA and CA are classed as overlapping benefits, you are normally paid the one that is worth the most, with NS ESA if you are placed in the support group then it is paid indefinitely until you are next re-assessed.
PIP is seperate and does not come into the equation, depending on your circumstances.
We always advise to seek help from your local welfare Rights Organisation, they will be able to take all your circumstances into consideration;
advicelocal.uk .
Gary