My current attorney will not return my phone calls or emails. I need to add our corporation into our existing Trust. Can I do this myself?

That is not something I would recommend as a do-it-yourself project. The best way to incorporate the corporation into your estate plan depends on many things: what type of corporation it is, what the corporation does (is it a professional service corporation?), whether there are other owners, and whether you hope for the corporation to continue after your death.