Cassy,
The problems you describe are quite common and can be attributed due to the following...
1) Nicotine is a stimulant
2) Increased levels of oxygen can make you feel tired initially
3) Disturbed sleeping patterns due to patch use
4) Dip in blood sugar
5) Dip in metabolism
6) Your body is healing and does this the most when sleeping.
Tips to help?
1) Sleep more than usual. Go to bed early or nap if necessary.
2) Consider an NRT as this can help alleviate the severity of withdrawal symptoms, this is though a personal choice.
3) Fuel your body! Complex carbs such as whole grains and proteins can help boost your metabolism for the day and keep your energy up.
4) Frequent small meals can help stabilize your blood sugar. Again, complex carbs & proteins are the best choice.
5) Vitamins - Smokers are often deficient in vitamin C and B, consult your physician, nutritionist or pharmacist for an assessment. (Hint: Bring a completed 3 day food diary to maximize what you get of their assessment.)
6) In times of drowsiness, liven it up by listening to music, taking a break, taking a walk.
7) Lastly, break up your tasks into smaller pieces, taking mini-breaks in between.
Hope this helps.
Danielle, Bilingual Health Educator