There are so many ways to treat a blockage in the throat chakra.
Here's one. First, follow this technique of self realization (it's 11 min) so that you activate the healing energy within you.
Then meditate and ask the healing energy to work on your throat chakra.
Vishuddhi, the throat chackra, is responsible for communication, the sense of collective, the left vishuddhi is responsible for your self esteem, right vishuddhi is responsible for your sweet expression. Sometimes a problem in one chakra actually may start in another chakra... So it's important to meditate so you can understand where the problem is stemming from. But if you just ask the healing energy, which knows you, to help out, it'll know what and where to work on. Trust it! :)
Here's the link
https://www.youtube.com/watch?v=p_CpyKSorwM
Cheers!