So... to be technical about it, vertigo is not fear of heights. Vertigo means you have trouble keeping balance. Vertigo will certainly make you afraid of height, it's the correct response when you can't balance very well. If you think you actually have vertigo you might want to chat with a doctor about it, you might have a fairly easy to correct (not surgical) inner ear problem for example. Diabetics get vertigo when their blood glucose levels are running too high. You get the idea, there can be various physical causes of vertigo none of which can be fixed by walking on rooftops clapping hands or consuming quantities of ginger
A good thing to know is that being on rope reduces vertigo because the rope balances your body position (assuming your harness is well adjusted etc.)
If you don't actually have clinical vertigo you'll be able to overcome fear of height by gradually increasing your tolerance for it.
I hate being on roofs by the way, although dropping onto a roof from a tree while on rope is cake. Rope makes a huge difference how you feel at height.
Good idea to pick up a throwbag and throwline and start practicing. An unsolicited tip for you: after you throw into the tree, assuming that the bag comes down, untie the bag before pulling the throwline back out. Pulling the bag back through the tree when you first start throwing will sooner or later result in a hung throwbag. Once you start climbing getting a stuck throwbag can be a good thing, it gives you a challenge to go get it.
-moss
