Sounds to me like plain old anxiety.
Horrible to experience.
But you can get through it and it is quite often easily managed with medication and/or therapy.
I am very happy in my life right now.
But it took a long time for me to understand that my life after my drinking career must be very different.
And I don't just mean being around alcohol- that's easy enough.
But I just like different things now.
That took time to realise and accept.