Do these "panic attacks" force you to reboot your MacBook in order to recover? If so then those are likely kernel panics as JChuzi suggests. Kernel panics are most often related to hardware or kernel extension problems and the items suggested by Jon are as good a place as any to start trouble shooting.
If these "panic attacks" do not force a reboot what you are seeing is more likely an application crash. There are lots of reasons applications crash but if you have recently upgraded to Yosemite it is highly probable the crashes are the result of applications that are out of date and not fully compatible with Yosemite. As with any upgrade to OS X there are applications that have to be updated or upgraded for compatibility with the changes in the OS. Applications purchased through the app store will be automatically updated but with non-app store applications you may be on your own to contact the developer to see if there is a new version available.
In either case the Apple stores are correct when they say the problem is too technical (or too complex) for them to comment unless you take your MacBook to the Genius Desk and allow them to troubleshoot the problem.
If we knew what it was we were doing, it wouldn't be called research, would it?
— Albert Einstein
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