breqn does not automatically break lines as expected

Question

I was trying the solution proposed in breqn does not automatically break lines, but it does not work in my case:

\documentclass{article}
% \textwidth=.7\textwidth % just to show the result
\usepackage{breqn}
\usepackage{lipsum}  
\newcommand{\breakingcomma}{%
  \begingroup\lccode`~=`,
  \lowercase{\endgroup\expandafter\def\expandafter~\expandafter{~\penalty0 }}}
\begin{document}
\lipsum[1-3]
$\breakingcomma
\Omega = \left{ q , \colon , d_{pq}<d_{pq'} , ,\forall {q} \in \Psi{\setminus}\left( {p} \cup {q'} \right)
,\forall {q'} \in \Psi{\setminus}\left( {p} \cup {q} \right) \enspace \land \enspace 
\left| {q} \right| = \delta \right}$
\
\
If I use the "breakingcomma" command, "breqn" does not work as expected:
\begin{dmath}
\breakingcomma
\Omega = \left{ q , \colon , d_{pq}<d_{pq'} , ,\forall {q} \in \Psi{\setminus}\left( {p} \cup {q'} \right)
,\forall {q'} \in \Psi{\setminus}\left( {p} \cup {q} \right) \enspace \land \enspace 
\left| {q} \right| = \delta \right}
\end{dmath}
\end{document}

Any suggestion? Otherwise, if breqn works as it should (?), how can I automatically break that long equation in the main text?