My 18 year old Autistic child struggles with periods

Hi, sorry to trouble you all but I was hoping for some advise.

My non binary (female) child doesn't like taking medication for anything, we have tried but it is always a "no". However when their period starts they are in a lot of pain, they can't cope but won't take anything, we use hot water bottles. We have advised them the pill will help, but the thought of taken medication every day does not appeal to them, Injection are a no no, implants get the same reaction. I can usually cope with every day things with them but I feel useless when they are on their period.

Thank you for any advice

Darren