\documentclass[12pt,a4paper]{book}
\usepackage{appendix}
\usepackage[bookmarksnumbered]{hyperref}
% load tocloft package; leave titles alone
\usepackage[titles]{tocloft}
% put a dot after the chapter number in the toc
\renewcommand{\cftchapaftersnum}{.}
% figure out length that the appendix labels
% in TOC will need to be.
\newlength{\appnums}
\settowidth{\appnums}{\textbf{Appendix B.}}
% throw in an extra half em of padding
\addtolength{\appnums}{0.5em}
\begin{document}
\tableofcontents
\chapter{Intro}
...
\chapter{Concl}
...
% Rather than use the \appendix command, we'll manually reset the
% chapter counter and redefine how chapters are labelled
\setcounter{chapter}{0}%
\addtocontents{toc}{\protect\setlength{\protect\cftchapnumwidth}{\appnums}}%
\renewcommand{\thechapter}{Appendix~\Alph{chapter}}%
\renewcommand{\chaptername}{}%
\cleardoublepage
\chapter{My appendix 1}
...
\chapter{My appendix 2}
...
\end{document}