Tried and tested!
I furrow my brow a lot, which makes lines in my foundation. I have found that heavily baking my forehead really helps. After applying foundation and concealer, I dip a Beautyblender into some loose setting powder and stamp it on the areas that crease. I let it sit while I do my brows and eyes, and then I use a big powder brush to wipe the excess off of my face.
Get a tutorial for this trick here.
If you're all blotchy from crying, press a cold towel to your face to reduce the flushed look. Use green concealer to hide red spots that didn't fade. This hack served me greatly whenever I cried over a "crush" or was just having a bad day.