I read the title and automatically thought - Well you have to go through Atlanta…

It is a reference to a comment made years ago by a friend of mine who was a frequent flier and was commenting on how every flight seemed to be routed through Atlanta…
Anyway - to your concern…
Given what you describe above, I am hesitant to think that you fall back into “Mortal sin” every couple of days…You may sin “gravely” but the very fact that you are struggling so makes me hesitant to agree that the sins are Mortal…This is perhaps something that you should talk over with your confessor…
What is happening is your fear is preventing you from feeling God’s Love. It could be that satan is working overtime to nudge you toward fear, or it could simply be that your faith has not matured enough yet. But in any event, the main thing to remember is that Love drives out fear. It takes time…but it odes happen.
So the thing to do is to forget about hell. Forget about what it is that you are running away from. That is like running a marathon while looking backwards over your shoulder…
Instead…Turn and focus on God…on Jesus…on His cross…on His Love…give praise for His many blessings.
Do not say “I fear you”, instead say “I love you”…When fears come…Laugh at them and say - “My God is my Love - who shall I fear”…
If there is a particular sin that you are struggling with (and all of us have one of those), pray for grace and help from your Love - then build a program to overcome the sin. You probably won’t quit all at once…Bad habits are like that…but you can commit to getting better. Depending on what the sin is you might even be able to track your progress.
But the bottom line is to concentrate of God’s Love and not on His Judgement. His Judgement will always be fair and how could he condemn one who struggles so to be worthy of His Love???
So you see…You have nothing to fear from your Heavenly Father…
Hope some of this helps.
Peace
James