Again you have to make sure your source for sharing is safe. Personally, when I was looking for resources to help me I ended up having more angst. Sometimes going to a good friend or unqualified source only brings you more invalidation. I went to three professionals who did not understand my situation. Two validated my choice but not my grief. One condemned my choice and completely invalidated my grief. So make sure you go towards safety and caring and compassionate people who understand abortion grief.
Admit you can’t keep the secret anymore. As in any path to healing in life, it is important you be honest with yourself and give yourself permission to re-visit the “abortion-box” no matter how long you’ve had it stashed away. Face the truth that keeping the secret is requiring much more energy than you have available to give to it anymore.