i believe it would be a good thing to follow up with your doctor or pdoc about how you are feeling. i am aware of severe head trauma causing personality changes but this is IMHO, not a skilled professionals answer. it's worth checking out..particularly since you noticed the symptoms after the accident.
hopefully you will get some reliable answers. it would at least ease your worry about what is going on with you. 
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Do not let your fire go out, spark by irreplaceable spark, in the hopeless swamps of the approximate, the not-quite, the not-yet, the not-at-all. Do not let the hero in your soul perish, in lonely frustration for the life you deserved, but have never been able to reach. Check your road and the nature of your battle.
The world you desired can be won. It exists, it is real, it is possible, it is yours..~Ayn Rand
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