Who do I tell?

Hi! I've never posted here so I'm sorry if I'm doing this wrong, but I'd really like some advice.

I'm 19F and live with my mom and sibling.

I've been struggling with restriction for idk how long and I've already experienced many physical health issues (amenorrhea, hairloss and receiding gums etc.). My gynecologist AND neurologist and has also been worried about the fact I'm uw.

My gynecologist diagnosed me with amenorrhea and thinks it might be bc of PCOS, but I had to gain weight before I can get bloodwork done, but I've only lost weight since then.

I'm kind of in denial about possibly having an ED/food problems, but I'm still considering talking about this with my therapist. I've been doubting for months now, but I'm scared my family will somehow be involved. I'm so scared it would change things around the house so much. I'm so worried about both my mom's AND my sibling's reaction, because I know from my earlier other diagnoses it didn't go over well at ALL.

Idk what to do, what would happen if I told my gynecologist or therapist, what would be smart? Will my family be involved/will I be admitted to the hospital or anything?

I might be overthinking this way too much, but ty for reading or any advice.