I'm a carer - is that why my PIP appeal failed?

i've been receiving standard rate pip, with no mobility component since 2104 for myositis/arthritis.

i developed breast cancer. i went through chemo, surgery inc anxillary node clearance with resulted in me developing lymphodeama, and radiotherapy.

Pip sent an assessor in February 2018, to review my claim.

I explained i was worse now due to the cancer treatment and lympodeama issues. I'm right-handed and the lymphodeama's in my right arm. I wear a full sleeve with attached glove. This won't improve.

Basically however the assessor said she saw me lift a half-full, 5 litre bottle with both hands and drink from it. it was actually a 2 litre drinks bottle, which had an inch of water in it. She also said I fluidly got out of my chair and walked with a slightly altered gait.

My pip award was stopped. 0 points awarded. I did the MR - that was refused too.

I just had my appeal on 16th January. I get carer's allowance for my husband, He has enhanced pip. I suspect this is the reason my appeal was denied. The panel made such a big deal of me receiving carer's allowance to look after my husband - even though i explained that i only offer companionship and moral support, not physical. The judge's questions regarding who dresses my husband and who dresses me were relentless. In the end I said we help each other to dress, but it takes us about 15 minutes each. With effort.

They awarded me 2 points for not being able to cook a meal - due to lymphdeama and 2 for wearing hearing aids.

They also awarded me 4 points for not being able to walk more than 50 metres.

My question is can i relinquish my claim for carer's allowance? Will it help? I want to re apply for PIP, but i'm worried and reluctant due to the stress.