Absolutely. Mustachianism is about optimizing your life, not just your finances. If there is something in your past that causes you recurring anger/upset, finding a GOOD therapist is worth their weight in gold.
That said, I am a bit biased, as I have ponied up for weekly therapy for going on 3 years now (and don't regret a single penny) after I went through something really, really traumatic with my family. I immediately sought help from a therapist because it was severely impacting my day-to-day life. As in, multiple panic attacks every day (but I didn't know that was what they were), constant anxiety, major depression, fear of leaving the house, couldn't concentrate at work, fear of people with specific hair colors and cuts in the grocery store... It sucked. Of course, my problem was sudden and hugely traumatic, which is why my symptoms were so severe and sudden. With childhood issues, your symptoms may not be as severe, but that doesn't discount them or make them less valid or worthy of being helped.
I went through two different therapists before finding one that really clicked. If you have trauma of any kind, whether recent or in the past, I really really recommend finding a therapist who specializes in trauma, CBT, and EMDR therapy. In my very first session with my current therapist, she led me through an EMDR session and literally halved the number of panic attacks I experienced--just one session! And each session after that, halved the attacks again, and now I haven't had one in more than a year. Making sure they are professional is important as well--they are not your friend. They are your support coach. I have seen my therapist every week without fail for 3 years and I still don't know anything about her personal life. She is a warm and calming influence on my life, but not "friendly", if that makes sense.
The price was hard to swallow, because at that point my DH and I were $100k in student loan debt, and I struggled with guilt all the time for spending all this money. But ultimately, my health is absolutely worth it. My quality of life had taken such a severe downturn that I was quickly spiraling into depression and worse. My therapist is single-handedly responsible for turning it around and getting me back into the light, and I am in a better place in my life than I was even before the incident. Besides, we made plenty of good progress on the debt and savings just by dint of being mustachians that it really doesn't matter in the long run.
Plus, you likely wont have to do this for 3 years, or you can have a different schedule (monthly instead of weekly). Also, be sure that they are in-network with your insurance. There are many ways you can keep the cost down. But I wouldn't compromise on the quality of therapist. Make sure they are skilled and professional, and also, you are willing to do the work. Therapy is one of those things that you get out what you put in. If you just show up and sit on the couch and chat, yeah it will seem kind of pointless. But if you are willing to put in the hard work even if it seems weird, you'll come out the other side lighter and freer.