Check if you can get Statutory Sick Pay (SSP) https://www.gov.uk/statutory-sick-pay
If not, you may be entitled to benefits, so check and apply as soon as you can. Check here https://benefits-calculator.turn2us.org.uk/AboutYou to see what benefits you can apply for.
There is also information on applying for New Style ESA here
The government has put a hold on all new evictions for 3 months, and it is always worth discussing your situation with your landlord. For more information on your rights as an employee, check here https://www.acas.org.uk/coronavirus
And for housing advice, check the Shelter website https://england.shelter.org.uk/housing_advice/coronavirus#Rent_payment_problems