I'm no software developer, but I do know that it requires tones of brain energy. I would assume you typically have highly productive executive functions. This creates a conflict with your concussed brain because a) your brain energy (ATP) production is compromised from the concussion, and b) your brain is trying to use all of its available energy to address the concussion.

My two cents is don't try to develop software at the same time as trying to recover from a concussion. In other words, take time off and rest your brain.