Sorry 'bout your eye, not fun at all! If you haven't ever used the eyewash I'd go ahead and start with at least 3 or 4 drops (especially if it's Dr. Christopher's) because after all it's gonna be hot and if you've gotta have hot might as well use more huh?
Wash it as many times as you can. I'll swear to you that after the first couple of times it won't be as bad for you and for me, my eyes feel so clean and bright after an eyewash.