Anxiety about my doctors appointment

Hi I feel really anxious right now. Over the past almost two years I've been getting medication for asthma. Because of so much drama between my parents when I was younger I apparently have two insurances which is great to know that I am covered but I'm solving issues that should have been solved when I was younger and its quite frustrating. When I ask them they either don't know or they might say one or two things and they might be helpful. So over this time I built so much stress and worry because I at times have had panick attacks bc I may not get my meds just bc of the confusion of the insurances. I recently turned 21 so I was automatically off of one of them, which I was happy about... at first. The doctor I had with insurance I got off of was better for me than the one that I am still with. The one I am still with honestly doesn't even believe in medicine. He advised me to not get vaccines and the only thing he was comfortable with telling me to get was this expensive af water and offered me some program he has at his office oh and detoxing.... my mom introduced me to him and she use to go to my appointments with me which was one of my worst ideas knowing her. It gave him room to ask me personal biased af questions like why don't u just stop having sex?! Like what?! (There was nothing wrong with me or anything, just bc I am sexually active and got tested of course cause that's responsible he tells me this) Or just giving me his personal opinion on things that I do that don't have to do with me not being safe or something serious that would cause me harm it's more of what he thinks I should do based on stereotypes and traditional expectations. I'm so worried he will tell me I can't continue my meds because of the way he practices medicine. Going through wheezing and trying to figure out the insurance stuff and going to the hospital and having panick attacks and trying different meds until I finally got the right kind but STILL having more issues with getting the meds just made me treasure breathing alot more and since I know these meds work for me I just feel so eager to argue with him like at the end of the day I will be the one wheezing without the medication, sleeping uncomfortably or not at all not him but bc of his views I might have to just deal with it?? It was so scary and I'm so afraid and I'm also even more stressed bc OF COURSE I'm going to change the doctor bc it's not the kind of doctor I'm personally looking for and that's again more issues could rise from that... Idk of anything to tell myself that could make me feel like I have control... ik I can tell him I'm uncomfortable with something or won't do it but I seriously don't know if thats enough because of his practices and personal opinions. My appointment is tomorrow with him