My parents never believe me when I tell them I'm in pain?

So for the past two years I've had stomach problems, really bad migraines, abnormal heart rate, blurry vision, difficulties breathing and even troubles with walking. None of which my parents believe. I used to tell them ever time if felt pain, they told me to take some medicine and get over it. I'd tell them every single day that I don't feel good, my stomach hurts, my head hurts. My family started making fun of me because I repeatedly said that I was in pain, every single day. Like is that even a thing to do? Laughing at someone for being honest about how they feel? Like instead of laughing at me take me to a fucking Doctor. Which I finally made them take me to doctor after telling my dad about, and him getting mad at my stepdad and mom for not taking me to Doctor. I went to the doctor and prescribed me medicine to help ulcers. Ulcers. I took the medicine anyways which it didn't help at all. So I went to the doctors again and she prescribed dicyclomine. The dicyclomine caused more problems then what my actual problems were. So I stopped taking them. A year later I was still having these problems so I started taking the leftover dicyclomine pills I had. Without parent permission because I knew they would tell me no. My parents never believe me when I tell them I don't feel good. They always say "oh she's just doing it for attention" or "she's just doing it so she doesn't have to go to school". I once went to school with a fever of 100.1 degrees because my stepdad thought that I was lying. My problems I listed in the beginning have become dramatically worse then when they started. It's gotten to point where I just don't tell my parents when I feel pain because they never believe me. I honestly believe that they don't give a shit about me. I also believe that I possibly have a brain tumor, but I guess I'll never know because they won't take me to a hospital for an MRI. Which I haven't asked for one because I know the answer. No.
My parents never believe me when I tell them I'm in pain?
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