Always Something Else to Worry About

It seems to me that being a writer means spending an awful lot of time worrying about writing rather than actually writing.

The typos have been corrected in my manuscript, helpful and insightful comments received from my first reader. I have digested these suggestions and decided how I intend to act on them - they were most helpful so I'd be a fool to do otherwise. Now the worrying begins.

Do I add to the manuscript as it stands, including missing/misleading information, adding a chapter here and deleting one there to polish what I already have?

Or do I write the whole thing fresh, using what I now know to construct a new manuscript?

I have read accounts of both approaches but I have no idea which one will suit me best. I lay awake last night trying to construct a new story from the bones of the old one and feeling very dissatisfied by what my addled and tired brain came up with. 

It seems to me that there is no 'right' way to do this but I'm worried that I don't know the 'right' way for me. So again I start stressing and worrying rather than getting on and doing anything. Just more procrastination!

With my sensible writer head on I know that the solution is just to get on and write. Everything can be tidied up later after all.

But my worry-wart head isn't convinced that I have the tools or skills to amend or re-write and at the moment she is winning and I'm stuck, paralysed by indecision. If I don't get on and do something I fear I will lose all confidence in this manuscript and it will fade away on the hard drive of broken dreams.

Now if only I could make some sort of decision ...