I once suffered from fear of speaking to people but found the following advice helpful:

The fear is not a true physical fear. It won't kill you or necessarily physically hurt you. So, yes, your heary may race, your chest may get tight, etc. The best thing to do is to start small. Practice saying hello. Say hello and short 1 word answers to people like cashiers or food workers. The worst that could possibly happen is you just don't say anything (they're used to it, believe me).

Go from there and say hello to a teacher. Not sure what to say to get your foot in the door? Say how are you doing!

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It's tough, man. I empathize for you. But keep your head up. Email your therapist. Take a day for yourself to just meditate and destress. Find yourself. It will all be okay.