You're not that heavy. On most wheels you can find a maker's mark or a decal that tells the maker, what model it is, and so forth. Araya, Bontrager, etc.

It'd be a lot easier if you would post a picture of your wheel, perhaps of the broken spoke(s) as well.

I've seen wheels ruined by LBS morons who don't know how to true a rim, so if the shop has already done work on your wheels, that might be part of the problem. At your weight, you should be able to use most wheels without much concern, unless you are abusing them.