I'm glad your going to try, it's so important! Even if it's just doing little things that usually make you happy, for me it's going to the gym or watching live music I find it really helps to take my mind off things and often prevent flashbacks because my mind is already busy.
It's always difficult to bring up all the old memories to try and combat them and it can be too much sometimes. If you will it will work well for you and this is just the rough patch of it then persevere and see how it goes. If it's not working then ask your therapist if you can try something else maybe

It will take some time but i'm really hoping that you'll get to a place where you can feel comfortable again. Definitely continue to post back on here though or feel free to PM me anytime too.