It’s a form of repression. Your mind can prevent you from feeling all emotions: happy, sad, angry.
I found not forcing but also not giving up essential. I tell myself that I get it. You are doing this to keep me safe but I am FINE!
Find gentle ways to “bring yourself back” to “now” help. Learning to teach yourself that your body and conscious mind are safe vessels. I myself meditate. Each time my mind drifts snd I bring it back to (whatever is your focus eg. Breath) you teach your mind to be in the here and now in safety. Emotional and somatic tracking are similar, as is a simple practice called “orienting” - you simply spend 3-5 minutes chilling out comfortably while looking around the room you are in (a familiar room is best) noting shapes of objects, corner, light dancing in the room or shadowy spaces, textures of fabrics, colors all with a sense of interest sort of like you’ve never seen those objects before.
You can also try a common grounding process: find 5 colors in a room, hear four things in the distance, feel three different textures, smell two different smells (even just air or dust..get creative and REALLY tune in) and taste one thing (inside of mouth, remnants of coffee..)
If you prefer to journal do that, every day.
Pick one thing and do it daily for several months. It can take time to convince your subconscious you are safe. As you do more TMS work and excavate or feel feelings, this sense of disassociation can get stronger. Generally it seems to mean you are working in the right area, your brain (psyche, whatever) just kicks up a fuss. Remind yourself you are doing the right thing and that you are fine.
It will pass. Mine passes and will at times return as I go deeper.