Other - None of the Above... Self study, research, experimentation, talking with others / peers.
Why? First time I did this I didn't know this was a "this". I didn't know it was PTSD, just knew I was FUBAR. I didn't like who I'd become, or what my life looked like. So I set about changing it, bit by bit.
I learned later it was PTSD I'd been dealing with. But by then it was past tense. So this time, when the shit hit the fan? I tried to be smarter about it. Desperate as f*ck not to go back to how bad things were before, poured on the research, trying to find help, find answers, find better/smarter ways to go about shit. Fortunately I found this place. Which has been unquantifiable, beyond helpful. Unfortunately I also found that my area has zip for resources in the areas I need help with. By the time I'd opened up my search parameters to include anywhere within a day's drive? (Took me about 6 months to exhaust local possibilities) I was also broke & without a car. Shrug. Life happens. Managed the train for a bit, but scraping together money for train fare & counseling & losing a day in travel time just was supportable even in the short term, much less long term, with no income. <grin> So it's self study, research, experimentation, & talking with others who've walked this road.