Other health conditions

I would like to know how is it that doctors want me to be the doctor in which symptoms go with what conditions? I have several health conditions, but none of my doctors can definitively say: “Oh, that’s a heart issue, but secondary to your MS. Or: oh, that’s your IBS, but but secondary to your MS!” I would like to go to a doctor that does not have tunnel vision. Even the neurologist says oh, you need to go see a cardiologist, because your symptoms are secondary to your MS. I may as well treat myself. I’ve done all the diagnoses!!! And sleep??? What is that? I wake up drinched from sweating!