My understanding is that therapy is most effective when it occurs within the window of tolerance. One aspect of that is that it is helpful as long as you are able to manage the emotions and issues that are stirred up in therapy in the time between sessions. If you are finding that the emotions are overwhelming your capacity to cope between therapy appointments then it is time to either dial back the intensity of therapy or work on developing grounding strategies to help you stay within that window of tolerance both in and out of therapy.
Ultimately you are the one who has to live with you between session, so it is a far better thing that YOU have the skills to cope rather than your T being that landing pad for you. If that is the case then you will be on an out of control emotional roller coaster ride that is wholly dependent on having contact with your T to manage your emotional state.

It is a far far better thing for you to develop the controls before jumping on the ride.