Autism is a spectrum, sometimes it seems like every autistic person is just a bit different from the next, and it's a tough thing to deal with. One of the things that tends to be a constant, though, is that managing your life and having really successful treatment isn't exclusively about medication. That can help a lot, yeah, and it's possible that you might need to take a look at that. You are still within a phase of physical development where a lot is happening within the brain, especially the prefrontal cortex. (I understand that a lot of other development is pretty well set, but there's a lot that continues to happen that's not immediately visible). So an adjustment there is very possible, maybe even predictable.
But there's all sorts of other things that go into this too, besides just the medication. Talking to a professional on a regular basis would be really helpful, hopefully you've been able to do some of that, and then there's certain activities and particular ways of engaging in relationships that can be incredibly beneficial to you and your mental state. If the person on the other end of it really knows what they're doing and has a particular set of strategies, these kinds of relationships can be incredibly helpful. A lot of what's happening very likely has to do with situations where one part of your brain needs to talk to another part of your brain, and those lines of communication are being disrupted. It doesn't feel good at all, it's quite disconcerting. Certain parts of the brain wind up being overly active while others are relatively inactive. This isn't repaired strictly with drugs, although that can help, a lot of it comes down to learned patterns of thinking and through particular ways of interacting with people relationally.
Now, what I'm describing here is not in any way a romantic kind of relationship. I want to stress that. You are fixating on that a bit (for reasons that are totally understandable) and I'm sure that would be quite nice, but it's not the best kind of specific answer to what you're going through. That can actually complicate a strategy that would otherwise be more effective. Again, I'm sure that will be a very nice thing to go along with everything else, but what I'm trying to describe to you is a set of potentially beneficial things you could have in your life that are not romantic in nature. Talking to a professional, more interactive therapy that involves doing a lot more than sitting in a chair and talking, some sort of non-romantic friendship with someone who's been helped along with strategies that can help you along. This is the sort of thing that can be done along with whatever else you're doing in order to help you through this in the medium to long term.
What I really want to stress, one more time, is that a romantic relationship is not a specific solution to what you have going on. It's a nice thing, and it will always be that, won't it? But let's not fixate on it too much, because there are some other things that you can talk to your people about, inquire into, and start exploring that can be much more specific solutions for you.