I know how you feel as I walk in your shoes too. I have been dealing with the Anxiety and depression for 26 years or so and I did very well for years on one medication and then it just pooped out.............
My Pdoc has had me on many different meds and I finally decided I would like to try going without the AD and just use Buspar, Valium and Trazodone, No SSRI for now as it seemed to make me feel worse or the same but no great improvement.
As Aries said each person is different and it may take up to 4-6 weeks for the full therapeutic effect of your SSRI med to kick in. If you can get past the side effects while getting onto the med hopefully it will be the drug for you and help you.
Remember to go easy on yourself right now and do not expect a quick cure. If your feeling anxious let your self feel and don't beat yourself up................you will get better. Practice staying in the moment..........do not worry about tomorrow.
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"When you find peace within yourself, you become the kind of person who can live at peace with others."
Not a mental health professional of any kind
Clickable Link: Anxiety-Panic Resources