Mom burnout, depression or adhd?

Mom burnout, ADHD or depression??

I’m not really sure if this is the right place to ask but I’m gonna try. I’m a young mom of one boy he’s 21 months old and he’s starting to get very defiant and he’s always been very active. I chase him around the house most of the day or he’s throwing a temper tantrum. He doesn’t sleep good at night.

I wanna say I’ve never been diagnosed with ADHD, always suspected I am ADHD but I can’t afford an evaluation. I was diagnosed with PPA and PPD after giving birth to my son but it seemed to have gotten better. I have mood swings (even prior pregnancy) where I feel great and I can get lots of things done and then I feel down and depressed. Lately I have been in this state of limbo where I am neither feeling great and severely depressed. I’m just here and it feels like life is just passing by. I have no motivation to do anything besides basic needs and cleaning here and there just for my son to have a safe environment but it feels like I am running off fumes and one day I will break.

Sorry this is so long but I feel i needed to provide context before asking what do I need to do? Are there any studies or research I can look at to benefit myself? I do get some breaks on weekends but I’m a single mother and I don’t work. I don’t have any other friends that have kids either. The ones that do have newborns and I’m not that close with. I’m sick of feeling this way.