Yeah it's very strong. Sort of resembles a mania. It's kind of what I imagine a person with type 1 bipolar disorder feels during their manic phase: a "top-of-the-world" feeling, combined with increased energy, inflated mood etc.
Problem is, it is almost always wrong in my case. Tends to happen to me with girls I shouldn't be with anyhow, very attractive but without much underlying substance to them, or on a occasion, moderately attractive but with a charming and quirky personality that really turns out to be a manifestation of some sort shittiness or instability/insanity.
Its always better for me going into an relationship without that mania. Problem is, its a bit more boring and dispassionate.
The withdrawal from "love" is severe, especially when its abrupt and cold-turkey. Every time I've fallen off the deep end in terms of drug use have been from love withdrawal.