Advice desperately needed-- on finance. Will I manage?

Hi all!

So I am in a bit of a unique circumstance.

A while ago I applied for student finance. Now, I come from a relatively low-income household and live only with my mother. Hence, when prompted, I claimed that she was 'separated' as this is what she explained the circumstances to me as.
Apparently, they meant separated in terms of legality and my mother does not have a solicitor, nor can she prove that she's the only adult in the house as my brother still lives here.

So anyway, a VERY long and stressful story short I am going away to Uni this year with a little under £4k for the year, although I should be entitled to a lot more.

If I do manage to get a job up at Uni, does anyone think this will be manageable? We really don't have a lot of money and could never afford a savings account.

I just suffer with anxiety a lot and, even though I'm not sure if I got into University ye (I had a conditional offer), I am worrying like crazy. I feel like I'm the only person dreading to go this year.

(My mother is hoping to apply for a divorce for next year, so that would be easier).

Any advice, encouragement, or the like would be really, really appreciated. I honestly feel like I have no one to talk to about this (I am the first person in my family to go to Uni), and am feeling really anxious. Thanks