I do it often. I've had 40+ years of training to use drugs, syringes and medical tools. I'd always been super-healthy so the past three years have been stressful.
First it was a DVT blood clot in my coronary artery.. Then it was white areas on my MRI. Then it was tremor and falling for no reason. So on top of good medical care I experimented. Without telling anyone.
My favorite is AHT: Autohemotherapy. In addition I self-treat with ozone injections or infusions. Then during a bout of depression I injected ketamine. Google it and you'll see it's a new treatment for depression that's not responding to pills.
One recurring sign is a tapping sound within my head. I had it the past several days. Last night I did an AHT treatment and today the sound is gone.
All of these treatments have been mentioned in medical journals. But it could be 10 years or more before studies make doctors comfortable with them. I don't wanna wait 10 years or more.
I'm not against standard medicine. It saved my wife from Lymphoma 30 years ago. It saved my daughter from the same condition two years ago.
But every time I see a doctor I have to stop myself from arguing with him.