You have a few options
Wrap the dipstick with a little bit of electrical tape (just at the rubber portion).
Get a new dipstick from a dealer ~$15
Squeze the dipstick tube very lightly with a pair plyers, so the stick "sticks" in.
Your pcv valve is that little hex looking block on the rear passenger side of the valve cover, that has the hose running into the intake manifold. Go grab a new one at a local parts store. Its not worth the hassle of putting the old one in, since a new one is only a few bucks.