So, you’re doing the right thing by addressing your anxiety by taking a SSRI medication, but not all are very effective. I take Fluoxetine/Prozac and it’s made a big difference reducing my anxiety in social settings and work etc… I’m on the phone on conference calls most of my day too! What also helps me is a vitamin nootropic stack of B1, Magnesium Glycinate, L-Theanine, Ashwaghanda. If I’m going into a highly stressful speaking situation like a job interview, I’ll take Propanolol and Baclofen. DO NOT use these on a daily basis. You’ll adapt very quickly and they won’t be as effective anymore. Use only as needed. Were you using Propanolol daily? If so, that’s probably why your brain got used to it so quickly. It’s only to be used as needed.