Hi Angie G :) Your story sounds almost exactly like my own. The whole month of January this year I had the worst case of bronchitis ever yet found myself still smoking. I finally thought; hey, this is just crazy!! I gotta quit smoking. I just stopped the next day and haven't looked back since so yes, it can be done. Like you, I was dreading how awful it would be and I think I was afraid of just plain failing.
What I found was yes, it was very hard for me especially at first but not unbearable if you had some tools on hand to combat the early stages of withdrawal. What tools? Drinking plenty of water or fruit juice, have things lined up to keep your mind busy and to keep your hands busy. Get plenty of sleep because quitting can be tiring at times.and, find a place like here on the Quit train where you can come and vent or ask questions or just communicate to others who have experienced the exact same things you are now experiencing. As difficult as it may seem initially, those days don't last for very long before things start to become easier to manage.
Finding this place and reading all the material available here as well as watching the videos has been a real key in helping myself to keep on track. The support here if a godsend! It's amazing to me what we can all do for each other collectively but remember, YOU have to be committed to your quit first and foremost. We can't do the quitting for you but we will be here cheering you on and lending support along the way.
Now let's get this done Angie!