Well, people won't ask questions about your PTSD or other disorders if you don't tell them about them. Are you telling strangers and people you just met about your disorders? Really you should only tell people who have shown they are truthworthy and caring about your disorders, IMO.

One thing that helped me was to figure out exactly how I would deflect such questions that I don't want to answer. Because of my MI, I have visible scars all over my body. When someone is rude enough to ask me about the scars (like the cashier at the supermarket) I just say, I was in an accident. And I say it like I don't want to talk about it. If they inquire further, I say just that "I really don't want to talk about it." And I say it politely, and usually they realize they've been a little impolite and back off. Because if someone has as many scars as me, they've clearly been through some pain and, of course, they wouldn't want to talk about it.

I have a service dog for PTSD. A woman on the bus once started asking me all these questions about him that really were questions about me. Like why did I have him, well, I have him for PTSD, but my medical diagnosis is none of your business, etc. Finally I had to say to her, "these are kind of personal questions and I don't know you, so please let me be." Well, then another bus passenger who had just gotten on asked me what breed my dog is, which is a totally fine question that I don't mind answering. It doesn't relate to my disability or anything like that. So I start to answer her and the woman from before yells really loud at the passenger, "no, she doesn't want to answer questions about her dog!" I felt like telling that woman to just shut up and mind her own business. How dare she interrogate me and then try and speak for me in a very rude way.

I learned from that incident that if someone starts to behave like her I cut them off immediately, and I had to become comfortable saying and believing "it's not your business." It's surprising to me how many people in the world lack boundaries and understanding of what is and isn't their business. In fact, I don't even tell people what my service dog's name is because if they start talking to him it distracts him from doing his job. And I don't want him distracted.

My point is, think of the situations and/or questions that you are worried about, and figure out ahead of time what will be your go-to answer for them. For example, if someone knows you have PTSD and wants to know why, maybe your response is "I"m really not comfortable talking about it, but I appreciate your concern. Maybe I'll tell you another time" then change the subject.

As you form new relationships, it's going to be awhile before you disclose to people about your MI, so you shouldn't really have to deal with these questions until then anyhow.

Good luck,
Seesaw