Anyone who is working out NEEDS more carbs. Just choose them from vegetables and fruits.

How about checking with the Exercise & Body For Life forums? There are people who are big into weights and other workouts and know about when to add carbs.

They symptoms of weakness that you described above are DEFINITELY signs that you need more carbs.

Be patient with your body - you may be asking it to do too much too fast. Please take care of your health first - no job is worth risking that for.