Thanks for reaching out.
Since you have already had a panic attack, it is mostly common to have such thoughts. But if you want to alleviate your worries and also determine the cause of weakness then you may consult me or your PSYCHIATRIST doctor so that further evaluation is done.
Take care.
Next Steps
Consult doctor
Health Tips
Also there is counselling help available which will help you better understand the nature of such attacks and help you live your life better.