Sometimes you just have to stop and do something else for awhile. It's hard to stop though until you can SOMETHING to work right.
I kept having problems with the thread breaking on my Babylock quilters Professional. I was sure I was doing something wrong-took it to the dealer & it sewed fine after she threaded it! I went home and it broke on me again! I was ready to scream--then I changed thread and---no problem!!! the thread was old so I tossed it and haven't had the problem since.