Apparently I’m too young for dysautonomia (27F)

So today I went to my doctor with all the blood tests and the CT scan she asked. I chose an internal medicine doctor because I thought this area could see me as whole and not just push me to the next doctor and the next.

Just for context I’m already diagnosed with IST by my cardiologist, I have symptoms that resemble IBS (undiagnosed), TMJ (diagnosed), I suffer from constant dizziness and vertigo, nausea, have trouble exercising, can’t stand heat variations well, and have had diffuse muscle aches for about 8 years now. If I don’t sleep enough forget about my day, it feels like I was ran over.

My tests are all within normal range apart from vitamin D and I supplement for that.

Today I gather the courage to ask about dysautonomia. Her answer left me perplexed and I think it’s simply wrong but I’d like to hear from you.

She told me I’m not old enough for dysautonomia (27F) and it would be the right diagnosis of I have a neurodegenerative disease. What do you think about this?

She prescribed propranolol twice a day , a probiotic and a combination of phloroglucinol+simethicone for my bowels. She think the underlying cause could be IBS but said we don’t have to investigate further if these work.

Why is it that every time I ask a question to a doctor I feel like im being judged or like it’s wrong to do my own research on sometimes that affects me deeply? Why is it that their answers are always so brief like they’re being forced to give them?