First of all there is a biological reason for chronic conditions of anxiety and depression. Problems with anxiety/panic attacks/depression are more than just a chemical imbalance. Stress hormones, such as cortisol, can actually destroy brain cells in the hippocampus area of the brain. When this occurs, anxiety and/or depression become the default settings for our brain. Anti-depressants actually encourage the growth of new brain cells in this region. That is why they take so long to work, compared to other medications. One will usually see degrees of improvement between 3 and 12 weeks of treatment.
You are only on 20 mg of Viibryd. This is a sub-therapeutic dose of this anti-depressant. The lowest therapeutic dose is 40 mg, so right now the Viibryd cannot do its job for you, and won't, until you reach the therapeutic dose level.
Yes, it would be nice if they could one day come-up with an anxiety medication that works immediately. But just like you can't rush the healing of a broken leg, you can't repair the damage to the brain overnight, either.
It is not easy, but patience must be learned when treating anxiety/panic attacks, and depression.
The very best to you, Lara!... Chuck