I would love to ask for more than 1 session a week and I tend to get 50 minute sessions which are just too short, when he has run over, which sometimes he does when he doesn't have another client, then just an extra 15 minutes makes a difference. 1 week seems an eternity. I can never cover all the stuff I need to and therapy just seems piece meal. (But I do have a lot of complications in my life). Like you I just cannot ask. My psychologist is very booked out and yes, since I already go weekly and feel like that is terrible I am so dependent and yes he will think I have dependency issues already then I can't ask. But the biggest problem is how much it all costs.
However I do think that more than weekly is much better for therapy and would produce much better results. I watch girl interrupted how luxurious 3 therapy sessions a week.
If you can afford it I would ask. Explain how you feel that it would benefit you and you could discuss if there is any issues about dependency.
I used to feel incredibly guilty about going weekly, in fact at beginning because my psychologist was so booked out my appointments were all over the place. Then after a whole load of dilemma and procrastinating, at the end of the year I said "I want weekly sessions" after the end of a particularly frustrating session, I just had to say it. And he said that is fine. And I book him for the whole year virtually. In fact last year he went away for 5 weeks and I told them no way I could last for that long and he offered me a substitute therapist and boy was I glad I did that because things went completely crazy across that period. If I had the money I would ask for 2 sessions a week, although yes I do worry he will think I am too dependent. He did say something about trying to increase the gap to every 10 days because of the expense, I said No way, I still need weekly. And I have been going over 4 years now, in fact coming up to 5 years and I have had all these guilt issues and shame about needing all those years, but now I am a member of a campaign to increase medicare funded therapy sessions, I talk with a whole load of therapists and also sufferers who are also therapists and they say it takes years, some of them 10 years just to get stable to do DBT. So there is no need to feel shame or guilt. The shame or guilt is coming from the policy makers who are trying to say people can get better in minimal sessions, so they can cut spending, which any psychologist will tell you is absolute crap. One week can feel like a lifetime, when you go through what we do; as I said I really would like more or at least longer sessions and I think it would have helped with the relationship as that gap is just too long for me.
I think good trauma therapists know that you need a lot of time so they would not think anything wrong of you asking for more sessions in a week. See every time I summed up the courage and asked, it was fine and I have been SO GLAD I did ask because it has made a difference. Maybe you could email, or write it down so it would be less confrontational to ask?