All of the below are just some things I have researched in the past, or have seen in my past, or others pasts. You don't have to answer anything stated as a question, but use it to self-diagnose yourself, for research, or for a doctor visit, if you choose. (Only so you will be prepared to answer some of the questions they often ask, related to smoking and quitting.)
Being tired and drawn-out, sounds like it is part of the dehydration issue. The holes in your lungs are wide, and are no longer being restricted with chemicals and tar. they are exposed, healing, and pouring out tons of water in the process. (You loose more water by breathing than by sweating and urination combined.) This makes your blood thicker, and harder to pump, and will tire-you-out faster than when you were all juiced up on analogs. Give your body time to adjust, but if this persists or worsens, consult a doctor immediately.
The food issue is most likely related to the lack of hunger suppressing and taste-bud suppression chemicals found in analogs. You salivate more, and taste-buds and your stomach now have the desire for stimulation again. You will feel that ache which tells you it is time to eat, because you are no longer applying an anesthesia to it.
Drinking water will dehydrate you. You are thinning out your salt content by adding unsalted water, which dilutes the salt, and makes your water harder to retain. Saline solutions rehydrate, by raising the level of salt in your body, helping it retain water by making the water more dense, and too dense to evaporate or breath away. Try gator-aide or power-aide or some trail-mix. (Salted snacks.)
If your nicotine level is low, as I am sure it is, you will have a slight higher stress-level than when you were pumping all those stimulants into your body. Your body should calm-down, as your brain reconnects, and your saturated nerves stop over-acting. Where once you had super-thinned blood that flowed freely into every nook and cranny of your body, through the restricted blood-vessels... Now, it takes a little more pressure, until the vessels expand again, and loosen. (This also contributes to oral and nasal bleeding, not uncommon when quitting smoking.)
There is a chance that you finally feel the damaged nerves that were being calmed by the anesthetic chemicals in your cigarettes. This additional sensitivity is most seen in users who smoked menthol cigarettes. Menthol will burn large holes in your throat and lungs, cause mouth soars, rot teeth, and damage nerves. You didn't mention if you smoked menthol, so I just threw that in, as it was pertinent.
How long have you been off analogs?
Are you using PG based or VG based nicotine?
Is it flavored with anything?
What level of nicotine are you using? (mg)
Do you bite the hard mouth-piece when you smoke?
Do you grind your teeth at night?
Do you have an over-bite or an under-bite?
Are you using a "mild detergent" toothpaste, made for sensitive teeth, or a toothpaste with sensitivity suppression like "Sensodyne"? (Being less painful to sensitive teeth is not the same as being a pain suppressor. Advertising trick wording.)
What is your approximate age? (You don't have to answer that, but sensitivity often increases with age.)
Do you have a stressful life? (The reason many of us kept smoking, was for the stress reduction which analogs provide. You may need to start reducing stress, if it was higher, only because you could handle it with the drugs in the analogs.)
Do you have gingivitis, or some other common gum disease that most smokers have? (Not dangerous disease, but one that causes discomfort, and a dentist would identify visually or has identified, such as swollen gums or dehydrated gums.)
Still have all of your wisdom teeth, or an impacted or recessed tooth?
Ever had braces?
