hip sinking keeping me from under 2 minutes!! but my head is down

We would do drills in swimming imagining the chest press or "T-press"...this is done by imagining pushing down from the shoulders in the attempt to raise your center of gravity from your butt towards your chest---if you are male--unfortunately this is a little harder due to your lack of body fat (sucker, only in this case), for females it is easier!

So I guess essentially the idea of gorilla butt is somewhat right. You need to make sure you arn't hinging at the waist though. Imagine that there is a rod through your spine. It will take some getting used to, because you need to adjust to a new body position in the water. It will get easier with practice! As mentioned before in many different forums, swimming is a highly technical discipline and unfortunately that means many hours in the pool are required...Body position is probably one of the most important technical aspects of swimming...because you are just not going to go quickly if you are plowing through the water!

You might want to look into some core exercises.  I know when I get toward the end of a long swim workout my form suffers, my hips sink and I know it's my core that's letting me down.

For me personally, my core is the secret to maintaining good form.  I use my core muscles to "push my chest down" and my hips up.  This keeps my legs from sinking.  At first, it may feel like you're swimming down hill, but the more streamlined position with your lower body parallel to the water surface really reduces the amount of energy you need to expend.

Pushing your head down, pressing the buoy/T., etc, does nothing but jack knife your body if you don't use your core to keep your body like a plank.  Thinking about raising your hips/butt is the same thing you'll just jack knife your body if you don't activate your core.

The imagery that's starting to work for me is to try and raise my hamstrings out of the water, that only way to do that is with your core.  If you have the core muscles and just aren't using them you'll make rapid improvements once you get it right.  If your short on core muscular strength (me) you'll definitely feel the core working when you swim right, concentrate on this feeling, swim often to build the strength till it happens naturally when your in the water.