oh no! sorry to hear that! Make sure that you are holding your threads for at least the first couple of stitches. I know if I don’t hold mine, they will get sucked back in. Make sure the thread on your bobbin is wound nice and neat. Take everything out and rethread the machine. Also, on some machines, you can adjust the bobbin tension and if this is off, it can cause stitching problems. You’ll have to consult your machine manual on adjusting this, if it’s possible. If after all that, and it’s still a nightmare, you may need to take your machine to a professional to look at. I hope your machine gets better soon and you can get back to sewing.