hi Jarp, as it happened, I felt comfortable in telling my manager that I was struggling with my emotions over the suicide of a young man I knew, and thought a few sessions would help me. I didn't tell everyone about it, but I was comfortable if someone knew. Later people who were struggling themselves actually came to me and asked whether it helped and I was happy to tell them it did.
Your manager knows about your recent past, and to tell to her you've decided that a couple of sessions would help you perform this task better would be well within good corporate practice (proactively managing your performance). Not that you have to tell her anything, but it's not a shameful secret either.
Please don't let the 'awkward' part deter you. We're not talking psychoanalysis here, but short term counselling get you through a crisis, or sort out a problem.