Welcome here to the Forum, a wise move on your part as you get to hear other's experiences, and hopefully let you realise what is happening.
All you have described sounds horribly familiar to me, including that fear of dying, the panic attacks, and nothing being physically wrong despite other symptoms. This came about because among other things I was suffering from depression (the hopelessness) and anxiety (the panic attacks and physical symptoms) as well as endless worry.
Thanks to the correct medical treatment which has included in my treatment therapy and medication I'm OK. I suspect I'll always need it though it is no big deal, and also thanks to my family's support I'm now a very different person. True I'm not completely 'cured' but have reached the stage where physical symptoms are under control, as is my anxiety.
So life is pretty good and yes I'm near to my old self (I'm older now) and happy, as is my family
I was a mess and held off for far too long before seeking help, and even then minimized things, this was mistake, it made me harder to treat. Please don't make it too, and be very frank with your psychologist, leaving out nothing, even if embarrassing or frightening. Without an accurate idea of the problem it can't be properly treated.
I mentioned family support, is there anyone in your life to support you, family or friend? Trying to cope on your own in isolation is hard. Just talking with another who cares makes a big difference.
I was a mess and am now good I'd be pretty sure you can be too
Please let us know how you go