You are no different to anybody else, neither those here who are no strangers to anxiety nor those who have never experienced it.
If anybody is subjected to enough stress they will reach a point of anxiety overload and our nervous system starts to complain. The bad feelings you experience are symptoms of that complaint, your nerves have had enough.
So do not believe there is something 'weak' about you or that you are a 'failure'. Anybody else would respond the same way in the same circumstances.
You are suffering from nervous exhaustion, sleep all you want for a while but sleep the sleep of the just: you have nothing to reproach yourself for. Before long it will be time to rise from that bed and look to your recovery.
There is no need for you to fear panic attacks and feelings of anxiety: they are not nice but they can do you no permanent harm. And they are temporary. They are merely brief blips in your nervous system which has become over sensitive because of your recent stresses.
The way to handle these bad feelings is to simply accept them for the time being. Do not attempt to hide from them, let them come, face them head on, agree to co-exist with them for the moment. That way you disarm them: by accepting them you prevent them from instilling more fear within you. Anxiety feeds on fear, by denying it that which it thrives on anxiety weakens and dies.
You cannot both accept anxiety and fear it, so choose acceptance and you will recover but you must give it time. As long as it takes. You will find you can continue to function even with attacks of anxiety: if you feel weak imagine some unseen force driving you forward. Feel yourself floating through your daily tasks as if on automatic pilot. Use your imagination and that unseen force will see you through the days ahead.
Anxiety and the fear of anxiety to come are the enemy, your recovery depends on co-existing and accepting those feelings for the time being. You must sleep with the enemy in order to undermine and overcome it.
So here is your non-med prescription for recovery, it is a piece of paper containing six words: Face, Accept, Float, Let time pass.
Your life is going to get better: you will emerge a better person from this ordeal. Not the old you that you yearn to return to but a new you that gives you back your quiet mind and the knowledge of how to protect yourself should anything like it ever happen again.