OP, how are you normally paid? Cash in hand? Bank transfer? Weekly or monthly?
Your employers are not companies who are obliged to draw up a contract with you regarding such matters as sick pay, holiday pay or exceptional circumstances. Nor are they the social services. 
If you want those kind of terms and conditions, you should get a job via an agency.
Put it this way, if you had wanted to leave the job at any time, you could just text and not go back and that’s that. I’m not saying you would do that, but you could.
They haven’t tied you in to a notice period or contract. You can hardly expect them, as individuals, not companies, to pay you for months on end!
Many people have lost their jobs. If the worst comes to the worst, you claim benefits like everyone else.
Maybe your “employers” have lost their jobs?
I’m afraid I find your attitude very entitled. Don’t return to anyone if you don’t want to. You are under no obligation - and this is the point! It works both ways.