If you’re sick, your supply will decrease and it’s normal. To build up the supply, you’ll have to keep pumping/latching and slowly build it up again. In between drink more water/soups. Stress is also a milk killer so try not to let it affect you. Give whatever you have, it’s fine to mix feed or even go full formula. Most importantly is your mental health and wellbeing.
I faced the same thing too when I fall ill. Unable to get it bk to original amt. So I am weaning off.. Too stressful
Adeee