Hello, idiomatic English does not use "also" in negative sentences. It is usually "either", "neither" and "nor", depending on the actual sentence and what the speaker means. However, many people use "also" in negative sentences when speaking informally but it usually conveys a different meaning than intended.

I don't want to talk about it either -or- Neither/Nor do I want to talk about it

The example you give is correct and understandable but it is not proper English in the US and sounds awkward and no native speakers say it.

Hi! The more formal way is to use "neither ..nor", like for your example you can simply say, "i dont want to neither talk nor think about it". Hope this helps, good luck.