Confused

Hi I claimed carers for looking after my husband but I am also on disability myself I was informed I was unable to claim carers but have an underlying entitlement I carnt get any extra money has I get contribution  based esa but was told I could maybe get a premium on my esa of £34 a week I rang esa and was informed by a very nice helpfull lady that I can only get the premium if I was on income related esa she then said wait while I check something when she came back on the phone she told me she was sending me an esa 3 form has I should have changed over to income related esa in 2013 has I was getting ib and in the support croup she told me she was putting on the form backdate to 2013 I'm very confused any info please