@SockYarn
OP had travel sickness. When you're being sick, in an aircraft, there's precious little you can do. All the hindsight about how she should have taken tablets, or should have done X or Z doesn't help when you're in that aircraft, trying to look after two children and puking. Miserable.
What nonsense.
If you know you are likely to have travel sickness - and the OP knew she was likely to have travel sickness - then don't plan on traveling alone with small children. Or take the tablets to prevent sickness. Her misery was the result of her own inexplicable refusal to take any responsibility for herself, in complete disregard for her children's safety as well as lack of consideration for the safety of everyone else on the plane. She deserves no sympathy whatsoever.
Did she give any thought to what would happen to her children if she were to become incapacitated and unable to be able to care for them?
Has she given any thought to what her children went through? They saw their mother puking for four hours during which she couldn't possibly have attended to their needs.
One of them had to sit on a loo floor because she hadn't taken covid into account when making travel plans and hadn't checked with the airline to make sure someone could watch the children while she went to the loo.
The OP took a grossly irresponsible decision and now posts in a state of high dudgeon expecting sympathy 
.
And she doesn't have Covid so she couldn't have infected anyone with anything. I would imagine that something like 99.9% of people who cough don't have Covid, people who puke don't have Covid, people who have a whole host of other symptoms don't have Covid either because there are hundreds and thousands of other reasons why people might be sick.
She doesn't know if she has covid.
Fixed that for ya.
A very high proportion of cases are asymptomatic.
Anyway. A lot of people are using Covid as an excuse to behave like total dicks
Covid seems to have brought out the inner superiority complex in a lot of people and the tendency to engage in vacuous virtue signalling.
Why does it matter why OP was flying? She is perfectly entitled to do so. No laws about leaving the country, or going to another country. She doesn't need to justify the flight to randomers on MN.
Because she was flying during a global pandemic on a plane in which passengers are distanced for a very good reason, and she decided for reasons that are not clear at all to undertake the trip, alone with children, despite not taking anti-sickness to ward off predictable vomiting, which involves spewing body fluids into an enclosed airspace. Even without the virus as the context of her flight, she should have made a different decision about travel sickness medication because she was in sole charge of two small children. In the context of covid, her decision, unless it involved vital travel, was grossly irresponsible to all the other occupants of the plane.
OP I hope that if you're on a return flight that you get a nicer flight crew.
I hope that she will take the bloody travel sickness tablets and spare her fellow passengers and the people who must work on her plane the misery of four hours of vomiting. And she needs to remember her responsibility to her children too.