The mantra of the Emotional Freedom Techniques (EFT) folks is "try it on everything." I would be surprised if you didn't get at least some relief using these techniques. Check it out. There is no cost except an hour of your time. And try it on everything.
One of the things you might want to consider is what you give up when you give up being ticklish. Your relationship with those who tickle you will change. As will your ease (and safety?) in different situations where you might touch or be touched. The desire to maintain status quo in these areas can prevent you from becoming un-ticklish. EFT can address your fears/concerns in these areas, too. In fact, you probably *must* address them before you will achieve results.
One of the things you might want to consider is what you give up when you give up being ticklish. Your relationship with those who tickle you will change. As will your ease (and safety?) in different situations where you might touch or be touched. The desire to maintain status quo in these areas can prevent you from becoming un-ticklish. EFT can address your fears/concerns in these areas, too. In fact, you probably *must* address them before you will achieve results.