Did you change anything just before you started getting the shakes? If you changed your hardware (battery, clearomisers, different ohm coils,etc.) that might affect the amount of nicotine you are actually getting. Do you chain vape? Are you under a lot of stress recently? Are you eating regularly? My daughter gets shaky when her sugar levels drop because she has not eaten when she should, or not eaten enough. Do you drink a lot of caffeinated beverages? Caffeine and vaping dehydrate you. You need to be drinking a lot of water to stay hydrated while vaping. Do not wait to drink until you feel thirsty - keep water with you at all times. Talk to your doctor about your symptoms, and be honest with him/her about what else is going on in your life.