Eww! 5 teaspoons is way too much!
A lot of people may say something about this, but I tried that "no-carb" diet back in November. it worked great for a little while, but I had one
problem: No sugar allowed in my drinks. I wasn't used to not using sugar in my coffee, so I went without for a few weeks. Then someone introduced me
to Splenda. Just like sugar, but no carbs. I tried it, and loved it!
I ended up dumping the diet because it made me feel awful, but I still cannot put real sugar in my coffee. I just can't stand the taste of it.
Your best bet is to slowly wean yourself down to a "normal" usage of 1-2 teaspoons. For one week, cut down to 4 teaspoons. A week later, 3. A week
later, 2. If at some point you can't handle the taste, go back to the usage the week before. Try not to go back to 5.
With some time, I am sure you can do it. And you will be healthier too, I'm sure. The sugar crash must be awful!
article on sugar