Help with anxiety???

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I’m currently struggling with crippling anxiety when going outside, my Fitbit tracks my heart rate and let me say, I did not do any exercise but my heart rate goes crazy outside. I had to take and collect my daughter from nursery. I will literally be sick beforehand. I’m on anti depressants and signed up for “talking therapy” in the uk but any other suggestions are welcome. (9am and 12 pick up)