ESA CREDIT ONLY CLAIM

I think I have posted this somewhere else of forum. So apologise I just cannot find it. I applied for ESA however they are only issuing me with National Insurance credits towards state pension at the minute I have 30 years credit towards my pension. I am thinking what is the hassle staying on ESA given that I will have to comply with all there regulations such as medicals and questionnaires for no financial gain.

I am on PIP and I was just wondering if I come of ESA will this effect PIP.

Thanks