I think a counsellor or psychotherapist. You don't actually have a disorder that you know of so probably a counselling psychologist would be overkill and an unnecessary expense.
I had some early trauma and suffer depression and runaway anxiety. My GP has been making noises about ptsd. I've benefitted a lot from counselling.
It helps just to be able to talk honestly with someone who is unwaveringly on your side, doesn't judge you, will not overreact to anything you say and is bound by law never to repeat a word of it.
No one even has to know you go. I have kept my therapy a secret for nearly a year and its a huge relief to just drop off the grid for 3 hours once a week and not have to discuss it with anyone. It feels like stepping out of your life for a bit.
You need to pick someone you are comfortable with so start on counselling directory or BACP website so you know they are registered and scroll. Don't be ashamed to judge a book by it cover. Look at their photos as well as their qualifications and experience. No use talking to someone who reminds you so much of your mother that you clam up.
Make a shortlist in your bookmarks of maybe 10 qualified, experienced therapists that you could talk to. Go through them and delete the ones that you cant afford or are a bit too far away to be practical. Look through the remaining profiles and examine photos. Are there any that you feel more drawn to? Make a ranked list and call them starting with your first choice. Set up initial sessions to meet them, its fine to meet more than one for a taster session. Usually a first meeting is cheaor even free as its just a chance to meet and see if you click. Some might not call back or won't have space in their schedules. Continue seeing whoever you feel more at ease with.
I picked my therapist from his photo. He just seemed very non-threatening. A first session is always awkward but you should feel safe with them. Talking about the hard stuff comes with time, when you've built trust with them.
Its taken me a year to really trust my therapist but now I will talk to him about anything. Shameful secrets, sexual hangups, womens issues, the lot.
They don't expect you to just walk in and reveal all straight away but they are trained to be easy to talk to. Have a go, you don't have to keep going if its not helping.