The medicinal part of cannabis is only the CBD (cannabidiol). The THC that causes the high has not demonstrated any medicinal value. In fact, it has been shown to cause psychological problems, especially for people who use it routinely during the maturing years (10 to 25 years old.)

If you want the medicinal value of CBD, it is most available in Charlotte's Web or ACDC (Oracle). At 20 to 1 CBD to THC, there is just enough THC to take the edge off.

Nicotine is not good for a compromised brain.

You don't say what your ongoing symptoms are. It appears that you manifest executive (decision making) struggles. This is common to TBI. Your life will benefit greatly if you can learn to accept the help of others, like your parents or extended family, when you need to make decisions. They were there for you through thick and thin and deserve your respect as they try to help.

My best to you.