Revision help!!!

Hi, So I posted about psychology advice and now I'm going to explain overall...

I am in year 12
I do A level: History (Britain & America), English Literature and Psychology

I missed at least minimum one topic from each of the above subjects because I recently had surgery

Now I have to learn them topics (really big and broad topics) by myself
I am getting stressed because i was only given these 2 weeks Easter holiday to do them because everyone has started a will be continuing the new topics after easter.

I am at my desk studying from 10am - 8pm with some short 15 min breaks and a lunch break and dinner
I sit at my desk all stressed out because nothing is going into my head!
I am doing psychology revision first which is explained in my other psychology revision post in the a level Psychology forum.

Nothing is sticking inside my head, I have 3 days to complete psychology revision and understand and memorise the whole of the topic I missed But I know that's impossible
But that's my only option because we will be starting new topics in every subject after Easter

So what should I do?
I have 4 very big topics that I need to read over, learn, revise, understand and memorise in under 2 weeks.

Any advice?
Should I ask for a longer deadline?
I should have learnt these topics by early May as well as the new/current topics we are learning and the topics we have learnt before because all of them will be on our mocks.

I have missed out on:

Psychology: Attachment topic

British history & American history (A good 6 or 7 medium sized topics)

English literature: missed ALL of Othello teaching


What should I do?
What would you do?
Any advice is appreciated

How many of these have you posted?