Mom acting like it's the biggest burden ever to take me to the doctor/ER

((I'm 17F. I've had pots since I was 12/13))

It's been like this for years. I had to BEG her literally beg to keep taking me to doctors to get a pots diagnoses after being told it's anxiety multiple times.

I've always felt like shit about this but recently it's been even worse.

I'm pretty sure I'm having gallbladder problems. I've had multiple "attacks" So much so I'd drop to my knees unable to stand up bawling my eyes out because of the pain.

Not once did she take me to the ER or a doctor. She'd throw me some Ibuprofen and tell me to sleep /nap.

I haven't had these very severe and painful attacks recently but I do have very bad stomach and back pain.

I told her I should see a doctor. and about 15 minutes ago I asked her if we have enough money. (to get some tests done.)

She was huffing and puffing. Kept complaining and said "What for going to the doctor?" I noticed her tone and just said "No no never mind." she got pissed and told me to "get off her back then."

Something else that's making me feel like shit is how she's the polar opposite with my sister.

A few days ago my little sister complained about some pain in her ear. Not even a day later my mom took her to the doctor.

I just feel like such a burden because of this. I love my mom so much but sometimes she makes me feel like I'm something she can't wait to get rid of.

If you have any advice for me on how to get her to understand me better please share it.