I'm Alicia, thanks for your question. I'm happy to help you today.
I'm very sorry to hear about the loss of your grandmother and your aunt in such a short time period. These losses can certainly have an impact on your symptoms, especially if you had a very close relationship and/or you feel like you haven't been able to fully grieve the losses. However, regarding the panic attacks - and it does sound like your symptoms are consistent with a diagnosis of panic disorder - I would urge you to consult a licensed mental health professional to discuss diagnosis and treatment options, as we cannot provide specific diagnostic information here, especially since we are not able to have an in-person evaluation.
Panic disorder (characterized by the presence of panic attacks) can seem to occur from "out of the blue" - researchers don't entirely understand what causes it, but it's believed to occur in part due to genetics, stress
(in your case, the loss of your aunt and grandmother), and certain changes in brain functioning. The main feature of a panic attack is that your body responds to certain stimuli (being in a movie theater or flying, which is something you would think would NOT be a trigger since you're so experienced in the air) as though you're in a life or death situation - even when there's no real apparent threat at all. So you experience symptoms like you've described and you might even feel like you're going to die at that moment, because you can't control what's happening to you.
Panic disorder is a type of anxiety disorder. It can be treated in a number of ways - most commonly with medication and/or psychotherapy. Because of space limitations here, I'm going to provide you with a few links from the Mayo Clinic that will explain about treatments and steps you can take to reduce your symptoms.
Treatments and medication:
Alternative medicine and holistic remedies:
Steps you can take to help your symptoms:
You should consult a licensed mental health professional as soon as you can, because there may be other underlying factors going on, and it's important that you don't try to self-diagnose your symptoms. However, if you are interested in more self-help techniques, you should also get a copy of this book:
I hope that helps. Best of luck.