This is more or less a guesswork, but did you install anything the day before? New software, updates / upgrades, even Windows updates?
If your system has worked well, you could try
1. A virus scan, although I don't think this is the problem, but a scan is never harmful
2. A malware scan with, say, Malwarebytes, not sure this is the case
3. A System recovery, Control Panel\All Control Panel Items\Recovery. When you click Open System Recovery, and go Next, you'll see a few options - you'll also see "Show more restore points" down left. There you can pick a point you want - it's not unknown that sometimes Windows Updates bring more problems than they solve, unfortunately.
4. Check what you have installed, via Control Panel\All Control Panel Items\Programs and Features or say, Revo Uninstaller, and uninstall latest programs?
I would recommend #3 and #4. Anyway, if you have sudden digestion problems, the question is, what did you eat? No offense here.