Mother in law tells my husband I’m on drugs… but I’m not

I suffer from ppd and anxiety panic disorder. When I have an episode or episodes my mind is racing I have a panic attack I feel like the world is doomed I’m doomed etc.. my husband doesn’t know what to do, calls mom in law or MIL to watch the baby a while.

She tells him she must be drinking or on drugs.

He listens to her a lot. He usually sides w her a lot.

I even went to urgent care to get drug tested to show that I’m not on anything

To prove them both wrong, urgent care staff were like are you serious about the reason for wanting the drug test I was like yep!!

My question is, I work, my husband does too. Baby is mostly in daycare but the times he needs to be picked up he has to call her to pick my son up. I want to rid her of our life (not forever, just until he realizes how much better our life was before her mettling in our lives).

My panic attacks get worse or appear when I know she’s around, weird right? She’s a trigger.

How do I gently push her out of our lives? Or what would you do?

Considering my husband tends to be on her side and never on mine.