Anxiety Support Group
Anxiety is a physical condition marked by intense and persistent feelings of distress, fear, angst or dread. General anxiety caused by routine day-to-day stresses usually passes quickly and is experienced by almost everyone at one time or another. However, such feelings that linger over time and are very difficult to cope with, and which lack a clear cause, may indicate...

I have not heard of them stopping working in one day. As long as you are taking them every day, the same dose each day, not skipping any days, or taking it at a way different time... then I would assume they are working.
I am thinking something is up with changing your doses around lately. That can make it feel "different".
Hmmm, just thought of something actually.... you take generic, right? Did you happen to fill your prescription with a different looking generic this last time? All generics are different, and act different. That might be your problem right there.
It's hard, but try not to think about it or look for symptoms. The more we look, the more our mind plays tricks on us. Try your best to just do your usual daily routine. Friday will be here soon. I so hope they will have answers for you. Let us know.
First, hydration sensitivity can happen, overwhelming anxiety in stressful situations, and lifestyle changes.
Take a breath, stop, pause, and repeat until calm. Repeat as needed.
For some people tapering off the anti depressant and then reintroducing it can work but doctor's will want you to try something new.
Good luck