Raising a child is difficult. Caring for a toddler more so as that is a 24/7 responsiibility. Doing so with PCS or mTBI I can not even imagine how difficult. Being angry is a natural result of such a traumatic event. Can you talk to anyone close to you? Do you have a support system around to help with your daughter?
For some this is a long road to walk. We need not walk it alone. If it is possible make time for yourself. Forgive yourself for being injured, you can not help the pain, or the feelings that follow.