I have quite bad decalcification and enamel loss, now I have a small crack, and also a 'hole'.. What are my options? (Photo)

I have quite bad decalcification and enamel loss, now I am noticing one of my very front teeth has a small crack in it near the top, and also a 'hole' from what I can only assume was a cavity... As you can see, I have had fillings in the front in the past. Sorry for the very unpleasant photo. I did not take good care of my teeth in my teen years, and I cannot stop drinking caffeinated beverages.

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