Heart palpitations, too hot/sweating when I sleep. See details?

You don't mention whether you are taking any medications. If so, check the list of side effects. The twitching could be due to a magnesium deficiency which is hard to detect even with a blood test. You don't mention where in your body the shooting pains are... which would help. See the doctor again and get a complete blood count. And try to improve your diet. Avoid all junk food for a while...especially soft drinks, sugar, and trans-fats.