I think you can take psychological therapy to cope with this fear and check as well with your doctor when you might be able to finish with the sertraline treatment. If he is ok with that you can ask him to prescribe you for example alprazolam for panic attacks and only take them when you have one. What I do is that I don’t take them but carry them in my purse to feel confident and have them as plan b if I cannot control my panic attack. I can tell you that with therapy, you can deal with this kind of situations indeed 🙌