@melb15
I'm going to try to say this really gently... you seem to be approaching two significant life-stressors at once: the serious illness of your father, and your wedding. So, please don't lose perspective, okay? Be nice to yourself in the middle of it.
You have a specific design for a wedding dress in mind, and I can well understand that that's your dream with regard to your own wedding. Only now you're rushing to bring that wedding date forwards, since you're also trying to juggle the not-dreamy hard reality you're facing, with your father's ill-health. I commend you for your wisdom in remaining unwilling to spend more on the dress than you've budgeted.
Since you now have some indications of prices, please do harken those warnings about the time for the consultations and fittings. Are they worth it, for you, at this stage, for you and your family, now, seeing as they will take you away from them? Maybe they are, for maybe that's one of your ways of being happy anyway, and making a really special day for you all.
Perhaps you'd like to read through this thread Wedding dress: Please, help me. if you haven't already done so, for some ideas of how another woman did it differently. She had a certain style of dress in mind, too, or rather a certain effect, not an actual particular design, and I don't know, of course, how very specific the design you have in mind is.
If you feel you have at least some leeway around the dress, if it could be more about the notion of the kind/type/style/effect you're hoping for, and if you felt comfortable with a certain amount of deviation from your original pattern, perhaps, just perhaps, you could strike it lucky, as the OP in that thread did.
If, on the other hand, you're certain about wanting that exact dress, if that's what you've set your heart on for your special day, I guess you probably feel that none other will do. In that case, I wish you well in your search, and please feel completely free to just click this post away, since right now you certainly don't need any more stress.