I've never been on medication, but I can totally understand a fluctuation of feelings or emotions. Human beings are built to adapt to situations, but they also appreciate the 'state' they tend to find themselves in. So, it's really not uncommon to be fearful of changes either in you or your lifestyle.
Similar to you, I didn't really have any dysphoric thoughts until I started thinking about transitioning at all. Many people have these feeling all their life, and I think many also have them but don't understand what they are- I think I was one of latter type of people.
It might be worth looking at the forum for de-transitioning and messaging someone who posted there for specific advice, as they could probably give you a much better idea when it comes to that.
But, I do think, similar to you, I am not really okay becoming a full woman; and by that I mean getting the surgery down there with maybe breast augmentation and FFS, too. Sometimes, I look down at my tucked self and rub the smooth crease, the idea of having a vagina makes me a little nauseous- but that is just me. Even still, the fact that it's so flat and smooth in front fills me with such joy, it's weird, I know.
But anyway, as I've seen on Susans and learned myself, many here are MtF full type of ladies, but there are also people that lie between gender and I think you'll just have to see what is best for you, hun. Because I remember you saying you'll be getting electrolysis on your face already, I think you should slowly transition towards female and just assess how that makes you feel with each thing- it's a very long and dedicated process, but if it's what's best for you, I'm sure you'll know. For me, each step I take to transition socially makes me feel really good, but sometimes they're pretty challenging, too, and that can place like a dark cloud over the whole process and start to fill you with doubt, which may or may not be what you have been experiencing with your dysphoria.