having a hair-mare, help!!

please no rude comments.

my depression has been at one of its worst lately and as a result my hygiene has again slipped into the non existent territory.

I washed my hair last Saturday but even after brushing it was still tangled, I haven't touched my hair since and realise I've made it worse where it's been hot weather and I've just been tying it up in a messy bun.

I've got no money at the moment and can't afford to get it cut even when I do have money next so I need help with what I can do to untangle it. I've heard soaking it in conditioner overnight works but I don't want to waste it if it doesn't actually work.

please any suggestions would be helpful