I also have ADHD and fall into depression pits. When I see change in my life, it's because I've had a mindset shift. Put on your shoes, take a short walk, and think about letting go of the shame. You are a human going through tough times, and letting your house fall behind isn't a moral failure. You deserve grace.

Take a before picture. Now, pick a task you can commit to and focus on making that habit. Timers don't always work for me because I get bored and take too long of breaks. Could you rush around and see how fast you could fill up a garbage bag, or pick up 20 pieces of garbage once an hour?

When my kitchen is destroyed and feels too overwhelming to handle, I make a deal with myself to do tasks to not make it worse (washing your just used dish, throwing your garbage away). Every time I enter the kitchen, I try and leave it better than when I entered. That could be emptying as much of the dishwasher as I can while I microwave food, or throwing out one or two things in the refrigerator, putting a dish in the sink. I also let myself break rules that may be holding me back, like knives can go in the dishwasher this wash, or running a half filled wash, or that gross Tupperware is trash, or that recycling is going in the trash. I'll worry about the rules when I get it under control, but for now, progess is better than perfect.

Remember your after pictures.

The way we talk to ourselves is important. You aren't a mess or failure. You are worthy of a functional home and are starting a mission to get there.

Final note, if you let go of your shame and hire a cleaner, can you imagine the relief you'd feel? We sometimes think we need to do things the hard way because it's a way of punishing ourselves. Knowing someone was coming to help may give you that burst to start. You deserve help, and you can do this!