It may not be illegal or against university policy to carry a handgun concealed on campus. You'll need to investigate the laws. I recommend you go to an attorney rather than the police (who are notorious for not really knowing the law).
That said, if you have a stalker, you should be carrying or have the gun within reach at all times. You should also get a folding knife and learn the basics of its use.
A gun is not a magic talisman to stop bad guys. You MUST learn when you may shoot. Failure to do so may result in a long stay with an ugly lesbian in a cage for a few decades. I hear the food is terrible.
The key here is to get professional training. Start with NRA Basic Pistol or any beginner's course. Make sure to ask the instructors a variety of pistols for you to try. After that, find a two day defensive handgun course. Concealed carry "training" is not about the fight...it is about the state regulations and complying with their licensing scheme (which is important). Do not confuse the two types of training.
Guns:
Avoid revolvers unless you cannot operate the slide. They are more difficult to operate. By "operation", I mean rapid shooting, quick and efficient reloads, malfunction clearance, moving and shooting, close contact shooting, and so forth. Operation is not "opening the cylinder and pulling the trigger". Shooting at targets in a shooting lane is not preparation for a fight with a stalker.
However, if the revolver is your only affordable option, then get one. Go with a gun chambered in 357 Magnum if possible. You can shoot mild 38 Special rounds all the way up through powerful 357 Magnum hunting rounds. If you go with a snub nosed revolver, then 38 Special +P may be the way to go.
All that said, the semi-automatic offers a variety of improvements. The first is faster reloading. Second is shorter trigger pull and short trigger reset for faster shooting with more control. The latter advantage can be overcome with lots of revolver practice, but it will take some time and lots of rounds. The typical advice on caliber is 9x19mm or greater. Small semi-automatic pistols are available in 9x19mm. However, if you're just starting out, it may be better for you to have a gun that fills your hand. It will be easier to learn with.
www.impactguns.com
www.budsgunshop.com
www.jgsales.com
www.topgunsupply.com
www.cdnninvestments.com
Do some browsing.
Some solid brands:
Colt
Smith & Wesson
HK
Glock
Browning
Ruger
Kimber
CZ
SIG Sauer
Beretta
Springfield Armory
I don't like Kel Tec or Kahr. I've had problems with these brands. I also had trouble with Kimber, but they're considered to be good by many folks.
Also remember that your purchase will require more than just the gun. You'll need a holster for the belt. You should have some sort of method to carry the gun off your body. You'll need some practice ammunition and self-defense ammunition, spare magazines or speed loaders, cleaning kit, and hearing and eye protection.
If you buy a used gun, make sure the gun shop will refund your money if the gun turns out to be a problem.
Small gun recommendations:
Glock 26, 27 or 33
S&W M&P 9 Compact or 40 Compact
The good thing about these weapons is that they accept longer magazines for their bigger versions. You can get a sleeve to go around the bottom of the magazine to fill your hand. This will help you learn to shoot and you can put the short magazine in for concealability.