I am not sure as I was never diagnosed, but I think I had something similar to depersonalisation after a breakdown about eight years ago.
I would look in the mirror and the person looking back at me seemed foreign, distant. I couldn't look at myself for very long.
It sounds weird but in the end I started to talk to that mirror. Talk to myself. Small comments like "what the %^&$ are you doing dude?" and similar. I'd then walk away.
Slowly I started talking to the mirror more, expressing my thoughts. Not long conversations, but generally what was on my mind. It seemed like verbalising these things helped somewhat. I think at that point I didn't have anyone else I could rely on to talk things through with and maybe this was *my* way of working it through.
When looking back on it now, I like to think I was reconnecting with myself, getting to know myself again, getting to like myself again. I think the person I was prior to the breakdown was now a stranger that I needed to get to know again before I moved forward.
Try and get some help (I know you said you can't afford it, but is there free medical where you are?), but if you can't then yes, walking, journalling, chatting to someone you can confide in. All can help and have helped me in their own ways.