Welcome to the forum and sorry to hear about your misfortune.
The good news is that fiberglass hulls are infinitely fixable. One other hand, these old boats are not expensive. If damage is too extensive, looking for another boat may unfortunately be a better answer. But you've not given us enough details, so let's assume we are in the realm where fixing the hull is a viable option.
From the fact that you are posting in this section we conclude that you have a DSII. Now, for that model, the cockpit molding makes access to the hull a bit more difficult for repairs, however, depending on where the damage is, you might be able to work from the outside.
Once you get your boat on shore and set up where you can work on it, the first task would be to use a grinder or coarse sander to get all the damaged laminate removed. As you sand away the gelcoat, the laminate you expose should look dark and clear. If it is white and milky, it is damaged.
If you have narrow cracks, you grind the flanks in a shallow bevel (1:12). You then lay up successively narrower strips of laminate until the crack is filled (wider strips first). Because the hull isn't very thick, you'll end up with a repair that's proud of the surrounding surface and needs to be sanded flat. Then covered with gelcoat or paint (the latter recommended for repairs using epoxy resin as prepping the epoxy for later gelcoat application is challenging. Many people claim it can't be done, but that seems to be an overstatement).
If you end up with actual holes in the hull, or cracks where the sides no longer align, you'll need to support the repair.
You could push a thin piece of wood through the opening (with a wire going through the middle) pull it flat against the hull from the inside and then put some screw in it through the hull. That would bring the edges of the crack into alignment and would support any laminate that needs to span the opening. However, after the repair, you now have a piece of wood inside your hull. If there's a nearby inspection port, you may be able to retrieve it (you may also cut your own inspection ports in a place suitable for the repair).
Instead of wood you can laminate a bit of flat fiberglass on your work bench. 3-4 layers is enough. When hard but not fully cured you can use it as backing, but in addition to screwing it in place, you can use epoxy glue. Then, after your repair is done, you have an internal "patch" over the repair that will add strength. (For gluing you need to prepare the inside of the hull by sanding/washing off wax. If the hole isn't big enough to do that from the outside, you may need an inspection port.)
I repaired a big gash another boat put in my bow using a method like the one I tried to describe. You can find the thread
here.
I had the advantage that I could place the patch from the inside, but it is possible to do this kind of repair "blind" (that is, with outside access only).
Looking forward to getting some more details from you.