The brain needs rest to even start to heal. Stress and over-stimulation are counter to this needed rest. Rest between periods of high stress or over-stimulation is not effective. It is important to moderate stress to avoid the peaks. The peaks are most likely to delay recovery.

You said, "I also read that there is evidence Topamax may help repair damage after a TBI." Where did you read this ? If it is true, it should be headlines.

Phentermine is the weight loss drug. It is a psychostimulant. Stimulants are not advisable for recovery. It could be causing problems.

Topamax is an anticonvulsive often prescribed for migraines.

In my experience, Christian pop music is too stimulating. I can not listen to it. I can listen to instrumental music with more 'impact.' I can also listen to quality vocals with quality instrumental accompaniment. I also struggle with music where the vocals are buried in the music so you have to strain to follow the lyrics. The brain wants to understand the vocals. If it can't, it overloads trying.