Hi and welcome Rushi
I started with a day one and went from there. That's not meant to be a wise guy answer - I started on say one, I used the heck out of the support here and I went from there.
All of those what iofs you've face them when you face them - but you won;t face them alone - post and read as much as you need to - ask for help and sometimes give some help or even just a sympathetic ear, to someone else
If you're worried about withdrawal, it's always best to see a Dr - they can check out your vitals etc
Your lifetime journey starts now
D