Ex Refusing Medical Care

My 16 yo son recently was hospitalized for mental health reasons and being suicidal. After several days, his doctor advised to start psychiatric treatment with meds and therapy. Ex and I share 50/50 legal custody and he has denied all drug treatment saying “just because everyone in my family is on anti-depressants doesn’t mean his son needs to be.” I asked that he listen to the doctor. He is also saying he only wants our son going to a certain therapist that costs 250/hour and be seen 2 times a week. I cannot afford my half, which would be 125 each session. My son is now home and is not in a good space. I am scared he will harm himself and without treatment I don’t want him alone. I’m already in a custody battle with my ex and can’t afford another lawyer to handle this issue. Is there a way I can file for emergency legal custody and get my son the doctor recommended treatment? All my ex seems to want to do is say no and put some expensive road lock up to getting his son actual help. I’m in California.
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