You need to be careful with the terminology here.
Initially you say you’re a director of a limited company but then you say you are self-employed.
There is nothing to stop someone being a director of a limited company and being self-employed but that means they would have 2 lots of tax to pay, Schedule E on self-employed earnings and schedule D PAYE and directors earnings/salary.
I think you mean that you are a director of a limited company but there is only you.
If that’s the case then you are employed by your own limited company. You are an employee
At the moment, the only help which is available for self-employed people is universal credit which has quite Draconian means tested criteria.
For employed people on the other hand the government are guaranteeing 80% of unemployed persons wages.
What we don’t know is whether that covers 10%-25% directors and whether just because it’s a limited company with only you win it, you are classed as employed for the purposes of the new legislation.
You need to remember that it’s been announced but not enacted yet, nobody knows what the rules are or how to apply for it (expect that it’s going to be administered by HMRC) although we are told that it’s coming in in April. That has been criticised because obviously people who have lost their income have lost it now, not in April.
So the short answer to your question is that at the moment we simply don’t know what you going to get other than above and what you have read already.
It also remains to be seen how the revenue, who have been getting rid of members of staff left right and centre is going to cope with this overload of work.