Awwww Lainey!!! So sorry to hear that!! Sending big hugs!!!
You need to sit down and really look into options open to you. Two I can think of are:
1) Invite only Mam's Dad's, Brothers and Grandparents to the actually ceremony. The meet everyone at your reception venue. I've been to a wedding where it was like this. I know you say you have a large family but really think about cutting it to real close family.
2) Book a ceremony in Dominican Republic (that's where you're off to isn't it?). If you've already booked the holiday then honestly, you can book an atctual ceremony for about £300. That generally includes flowers and cakes, etc. If you're saving on the wedding then it may help to free up some cash. Even if you have a big party when you get back, you won't need flowers, cars, etc. I'm more than happy to help you look into this option!
If you want to chat, you know where I am! (my email address is on my FB profile)
L xxx