This was one of the first things I learnt about therapy, from my own personal therapist.
When something feels uncomfortable to explore, you should focus on it. Talking about painful material in therapy is beneficial because this brings the material into the present where it can be looked at and understood. This is the time to feel uncomfortable so that your therapist can perform the psychological surgery that needs to happen for you to feel better later. Draining an infection is never pleasant, but it is necessary.
Avoiding a negative emotion buys you short term gain at the price of long term pain.