let me know if still need help on this…
I hope you were able to get with a Priest and work these things out.
if you do have a difficulty with scruples…it can actually happen often that the scruples get into the very question of ‘are these scruples’ --or do i have scruples…etc this is why the French call scrupulosity the doubting disease…not that it is a disease mind you. for one is prone to doubt…the unreasonable kind.
as for mortal sin:
one needs grave matter…full knowledge and full consent. lacking any of these three there is no mortal sin.
one is not obliged to confess a doubtful sin. and that goes for a doubtful mortal sin as well.
and for someone with a tendency to scruples and seeking to follow Christ or even a person seeking to live a good life and follow Christ without scruples – if they doubt that at the time the three things were there for mortal sin they can assume -judge that they did not…
as for Holy Communion:
One who is conscious of unconfessed mortal sin is to refrain (-there are rare occasions when this is not the case but we will not go into them now) .
that is a mortal sin.
a doubtful mortal sin is well…doubtful. one is not morally certain they committed a mortal sin.
So a doubtful ‘mortal sin’ does not fit into that category regarding abstaining from Holy Communion. for one is NOT conscious have having committed a mortal sin --by definition.
So it would seem that what you could do is make an act of contrition --telling Jesus that you love him…and if you are not conscious of mortal sin …you may go to communion.
for instance you can pray: Lord Jesus I am not conscious of any mortal sin but I am sorry for the sins I have committed --out of love for you–I ask you the grace to follow you faithfully as your disciple.
(I assume of course that you are Catholic…and fasted for an hour before Communion etc)
Hope this helps