I strongly dislike decaf tea, but fortunately there are some very good options for you, even if you are a black tea lover.
There are several caffeine-free herbs that taste very tea-like. None of them taste exactly like tea, and they all seem to capture different aspects of tea's flavor, aroma, and body. One is Rooibos...some people love it, some hate it, most somewhere in between...if you haven't tried it I'd definitely recommend getting a red rooibos and seeing what you think of it.
Another herb that is often neglected as a black tea substitute is red raspberry leaf. It's most known as a women's health tea, but unlike some medicinal teas recommended for women, it doesn't mess with hormone levels and is safe for men to drink as a beverage too. Flavor-wise I find it captures or emulates different aspects of black tea's flavor and aroma than rooibos. It's perhaps a bit thinner bodied but the aroma seems to resemble black tea more than rooibos does.
Another one that is not widely available commercially, but is easy to grow, is New Jersey Tea. I haven't tried it but I've heard it tastes very good, and I've been eager to try it because I hear it has a hint of a wintergreen-like aroma, a hallmark of high grades of black teas.
Yet another option to consider...a true tea but one that is low-caffeine, is hojicha, Japanese roasted green tea. The roasting destroys some of the caffeine, and the dark-roast ones have little caffeine in them. However, the darker ones have a stronger aroma, a little coffee-like...I find that this type of tea often pleases black tea lovers because of its rich color, aroma, and body. It has a much milder flavor though...very smooth.
You also could try branching out into non-tea-like herbs...there are some that don't resemble black tea at all, but that I find delightful. I love tulsi (holy basil), and I also love spearmint, apple mint, lemon balm, lemon verbena, pineapple sage, orange mint, and many others.