Having suffered for almost 3 years with intrusive thoughts OCD, I can totally relate. I am not able to get to a therapist for many reasons, but priests in the past have made that recommendation. I fear if I go to a therapist, they won’t take my faith seriously and that’s where it gets tricky. I’m hopefully going to find a spiritual director soon, even though I know priests can be quite tied up.
For people who also have scrupulosity like myself, it’s best that we follow a separate set of commandments which can be found here:
Ten Commandments for the Scrupulous (Hopefully that link works, sorry I’m new here).
I want to say that it’s best to trust in the love and mercy of God. I have often felt like if I make one wrong judgement call, that He will practically strike me down with a bolt of lightning and say “You failed” and I will be sent to hell (no joke). Luckily that has not happened.

Our Lord is not a tyrant king.
This condition is hard and brutal, many saints have suffered from it as well. I can say that even though we have such a hard time with our faith and wanting to follow the rules to perfection, that it’s not entirely bad. We have somewhat been gifted by God to understand the value of our faith (obviously taking it too far at times) but there are people who are so lukewarm it pains me greatly. Jesus wants us to be happy, but He also wants us to make sacrifices to show how much we care. He put us on this earth for a reason and each person has a different trial.
I encourage all of you to talk to a priest in confession about the kind of situations that stress you out the most. I have a hard time doing so and sometimes I just want to make a quick confession and leave, but that starts the pattern all over again. Try to make a weekly confession with the same priest and tell him your highs, lows, and what you are confused by. Some priests out there really understand OCD so it’s better to find one of them. I’ve been gifted with several.
My intrusive thoughts are probably the hardest thing to deal with because the thoughts will prod at me and the only way to relieve myself from their torment is to think of the exact thought that I’m NOT trying to think of in the first place. I never understood that at first, but I’m finally able to explain why I sin, or why I think I sin so much. Maybe other have this same issue?
Busy yourself with something, that’s the biggest thing that I find helps. Busy yourself with something religious too, satan looks for idle minds to prey on. Pray multiple rosaries in a day if you have the time. I like to do 1-3 rosaries a day. Mary can help anyone. Persevere, don’t let your failures get you down. Our greatest strength is that we get up each time to try again.
May the peace of the Lord be with you. I have so much more to say on this topic but I don’t want to be long winded.

Hopefully some of my advice will make it to those who need it and for those who need a bit more confidence. We’re all in this together and no one is alone. God bless!