Human body has an amazing ability to heal, you just got to let it by removing barriers and nourish it.
After a major trauma, the effect often lingers even after recovery, is it physical still or psychological? You have to decide for yourself if you can’t figure it out after doing all the tests.
Now the pills, if there is a way naturally through diet, that could be much better.
Maybe something you are doing daily is still making the association to the incident, time to change it up if possible?