what you can always do is find a business coach to work with. Of course, you can't share project specifics. But project specifics can usually be resolved within the firm, it's more the "other" stuff where an external coach might add more value (personal development, career choices, issues within the team or with superiors, leadership challenges, stress, anxiety, ...).
I myself have been working for more than five years now with a coach, first as part of the leadership development program of the firm I was working for at the time and later paid out of my own pocket when I started my own business. Before she started her own coaching practice, she worked 15+ years in personnel development at MBB so she knows consulting and consultants inside and out.
Of course, that experience doesn't come cheap - her hourly rates are pretty much what you pay for an MBB consultants' time. But for me, the investment has been worth every penny. And you usually don't spend more than two hours a month or so with such a coach (except maybe in the very beginning). I myself do a checkup of about 1.5 hours every 6-8 weeks, of something ad-hoc if there's an issue I believe she can help with. So the cost is manageable.
Hope this helps.