Eating crap makes you feel like crap. Once you get off the junk food, you really notice how bad it makes you feel. With insulin resistence anything with sugar or a lot of white flour will make your blood sugar climb.

When you were eating it all the time you didn’t notice how sluggish, tired, and crappy it made you feel.

Now you do.

Stick with the healthy stuff, your body needs and craves it.

I suggest you get tested for diabetes, because of the problems you are having processing sugar. Ask your doctor to do an HbA1c test. It should be below 5.5%.

Good luck!
References :

It is possible to have insulin resistance that fall short of diabetes.

Insulin resistance is when your cells respond less and less to insulin so you need more and more to do the same job. Your pancreas responds by making more insulin. When it reaches the point your pancreas can no longer make enough to keep up, that is type 2 diabetes.
References :

Hypoglycemia in new diabetics is surprisingly common. Eventually, though, the beta cells in the pancreas die or the insulin resistance gets so bad that the hypoglycemia side of hyperglycemia stops and there’s just hyperglycemia left.
References :

The way that people need to manage there diet varies depending on the type of diabetes that they have and the way that they manage it.

Many medications can effect your blood sugar. This is why they ALWAYS print this on the warning label. I have type 1 diabetes and I take these cold medications anyway.

Here is a great online community for people touched by diabetes:
http://www.tudiabetes.org
References :
http://www.tudiabetes.org

I would refer you to the page that Kelle has, obviously, misinterpreted. Nowhere on that page does it state that insulin does NOT cause weight gain.

The second page listed below states:

"In many people taking insulin, a common side effect is weight gain. Insulin can cause people to gain weight for several reasons. For example, insulin reduces the removal of glucose (sugar) from the body, and this excess glucose is stored as fat. However, taking insulin does not automatically mean you will gain weight. If you are taking insulin and notice that you are gaining weight, you may be able to control your weight with proper diet and exercise."

You’ll need to read further to see why it is believed that this can be the case.

The third url below states:

"Weight gain is a common side effect of insulin therapy for several reasons. The most widely accepted reason is that insulin therapy improves your body’s ability to store sugar. When your blood glucose levels get too high (which is why you need insulin therapy), your kidneys try to pick up the slack by excreting more glucose through the urine, thus eliminating sugar and calories before they can be used by the body or stored as fat."

This is NOT, however, a medical site, so you’ll need to bear that in mind.

You don’t state what your current medication regime includes, but from my own knowledge, and discussions with medical professionals, one drug that is often used, both in terms of controlling type 2 diabetes and aiding with women that suffer PCOS (Polycystic Ovary Syndrome) is Metformin (Glucophage). One of the side-effects of this particular medication is that it encourages weight loss, though medical literature don’t encourage it being prescribed for such reasons.

Have you spoken to your doctor about this, and expressed your concerns? S/he may consider other options.
References :
http://en.wikipedia.org/wiki/Polycystic_ovary_syndrome#Insulin_lowering
http://diabetes.emedtv.com/insulin/insulin-and-weight-gain.html
http://www.dayseeker.com/2008/insulin-and-weight-gain-tips-04-19.html