You are panicking.
You need to work out your priorities.
From what you’ve written, you are the only adult available for your children at the moment.
If you get sick, nobody available to look after your children.
If one of your children gets sick, nobody available to look after them.
However, if you lose this job, presumably you will have no income to support them.
Your and your children’s health is your priority, together with an income stream.
Ask your employer if you can wfh. If not, if you can work a few hours at work and the rest at home. Wear a mask at work. Send your children into school for the few hours you’re at work each day. If none of those are possible, you will need to look to other sources of childcare (school, relatives, friends - better than flouting the rules is not starving or becoming homeless), or another source of income. Talk to your boss in these bald terms. At all times keep in mind that everybody - including your boss - is juggling and struggling with something. Be creative, be collaborative.
Don’t place your DS on a pedestal. He will be fine. Worse than him being bored or struggling temperamentally is him having no roof over his head or food to eat. He’s special to you, but he’s no more or less special than any other child living through this.
Good luck.