The lever came off my thru axle. Now what? I have a bike with a 15x125mm thru axle at the front. I tried to unscrew the axle, but only the lever unscrewed (detached completely), leaving the axle in the fork. This leaves me with two questions.

First, how do I remove my front wheel now? The axle does not have an allen key socket, or any other way to remove it, as far as I can see.

Second, if I figure out how to remove it, how would I replace it? Will any 15x125mm axle do, or is there something to consider beyond dimensions?

https://www.planetx.co.uk/i/q/WSBBB/on-one-bish-bash-bosh-frame-axle
Does not sound like a great design, presumably the lever was supposed to be tightened onto the axle body tighter than the axle in the fork.  

Two possible methods to get the axle body out:


Use a threadlocker such as Loctite to bond the lever to the axle body. There are two kinds of Loctite: Blue and Red. Blue is weaker and designed for preventing fasteners vibrating loose. Red is stronger, designed to be more permanent and is loosened with heat. Red may be appropriate in this case.
Find a bolt that fits the internal thread of the axle body and a nut and washer that fits the bolt. Put the nut and washer on the bolt, screw the bolt into the axle (in place of the lever) tighten the nut against the axle as a locknut (with the washer between the nut and axle to protect it). Hopefully when you back the bolt out the axle with come with it.