You are experiencing anxiety because you fear this Jinn. This is the first mistake you've made, you should fear nothing except Allah. Remember him and keep your prayers consistent and he will always protect you.
The Jinn fear Allah, that is why it left you.
There is a possibility this isn't a Jinn at all. It may very well be an anxiety attack, temporary loss of control followed by panic is very common in such a case. Have you seen a doctor about this ? You should, because you may very well have a genuine condition ( that will progress, if you leave it unchallenged) that will worsen if it isn't looked at. Don't leave any possibilities sister. Better safe than sorry.
Also, I highly recommend you memorise Ayat-ul-Kursi and Sura An-nas, there are very potent in protecting you throughout your day.
Peace be with you,
Usman
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