Can anyone help with Stihl fs45 problem, possibly primer bulb??

I used a stihl fs45 weed eater and it worked fine then was a little doggy and wanted to bog out after I let off the gas to let it idle unless I hit the throttle real quick all the way again. Now it won't even start and thee is air in the primer bulb. It seems like its not getting the prime. Is that the problem? Is it possible to cause that from using prime bulb too much before start. Any advice on what could be wrong or how to fix it would be much appreciated. Thanks