Looking for a tripod head for vertical shots??? Please help!!! :)

I am looking for a tripod head for vertical shots. Do you have any recommendations? My head can't support my camera with heavy lens attached to it while the camera is in the vertical position. It doesn't swivel sideways, either.

Please help!!!

Bogen/Manfrotto probably has what you are looking for.

http://www.jeffreyglasser.com/

Get an L-plate for your camera.

What do you think the best is to get an L-plate or a sturdy tripod head?

Which tripod are you using? Some tripods cannot fit different heads!

I think L bracket is better than flopping the head over on its side. But you might not have an L bracket option for your configuration! Generally L brackets are made to be used with Arca-style head clamps.

Is the problem that the camera slips down? Or, is it that it's tippy if the camera is on it's side? (or something else)
If the camera slips and snugging the mounting screw doesn't help, you may need to replace whatever surface the head has to something that has more grip, or shim it with some hobby foam or some such to get better grip.

The larger ball heads are usually more stable than pan-tilt heads for setting the camera up for verticals. For pan-tilt heads, the Gitzo ones are nicely beefy and nicely made, though a lot more dear to buy than Manfrotto.