Applied for carers allowance, wish I hadn't.

Hello all,
I am 59 in August, disabled and receive PIP at the lower rate for DDD, which makes it hard for me to function normally. I have difficulty standing/sitting/lying down, and can't walk very far. I was working until March 15th, but my employer removed me from a job I could do, to a job I couldn't, he expected me to stand in one position for over half an hour, which I can't do, and when I asked for a stool to help me, it was refused (I must add I was a school supervisor, and asked to supervise the dinner queue), I was in tears, and felt humiliated and embarrassed and I had to go off sick for a week, I had a panic attack every time I thought about going back, so after the Easter holiday, I handed my notice in, I couldn't see any point gong back if I wasn't going to get any support, and the whole thing has stressed me out so much.
When I told my elderly mother what had happened, she asked me if I'd be a full time carer for her, she's extremely ill, and my sister and I have been helping out when we can, my sister does the jobs I can't, like cleaning and helping her dress etc (I can't even do these things for myself), I do things like take her to hospital appointments, Doctors, shopping etc., and I'm just there making sure she's ok.
I live 20 miles away from my mother so I've applied for carers allowance, because now I don't have a wage, it's costing me up to £50 a week in petrol going backwards and forwards every day, and I'm having to put it on my credit card, and I'm falling into debt.
Now I've heard I won't get carers allowance, and may even have my PIP taken away, because by applying for carers allowance, I am saying I can look after someone else, but I've already told DWP, I can't even look after myself, which I can't, so I'm contradicting myself.
I don't know what to do, it's affecting my mental health now, I'm suffering anxiety and I'm having palpitations every day, I've been sick, and my blood pressure is through the roof!
I just feel I can't cope anymore.
It's four weeks since I applied for carers, and I haven't heard anything, and I'm wondering whether to cancel the claim, because I feel I'm going to have a heart attack any day through the stress of it all!
Can anyone advise please.

No I can't prepare meals for myself, and I can't prepare them for my mother either, my sister does those things. But there are things I can't do for myself, that I can do for mum, like cutting her toe nails and helping put her shoes on, although I can't do my own. Only someone with the same condition as me would know how it works, because even though I can't bend, I can and do, spend my time on my hands and knees, as it's more comfortable for me, so it makes it possible to do things for someone else I can't do for myself!
I'm hoping that as it's been so long since I applied, it's got lost in the post and I won't hear anything, because to be honest, I'm already struggling having to go every day, and I don't think I'm going to fulfil the conditions of 35 hours a week.