This state of mind is referred to as Kathirush shak (کثیر الشک)/
one who doubts too much.
And in this state one can and should ignore their
doubt and assume that they have correctly performed that part
of the prayer which they have doubt in.
I have to say the details of deeming a person Kathirush shak
wasn't easy to understand (p.418) and not easy to explain.
But, if you doubt at least in every third prayer for
more than three times then you can deem yourself as
A normal person who doubts at least once in every three prayers, should ignore his doubts.
Things which invalidate prayers » One who doubts too much
As a plus, if it is convenient for you to attend congregrational
prayers and offering your prayers in it gives you peace from this
excessive doubting then you must attend the congregration.
If a person is so obsessed with doubts and anxiety during prayers,
that it leads to its invalidity, and if he finds peace only in
congregational prayers, he must offer prayers in congregation.
Congregational prayers » Introduction
Can I take a break from prayer until I fix the mistakes?
It is not at all permissible to halt or take a break from
saying prayers. It's forbidden to do so, and if done
one has to make up for them.