Hi Laia,
I think both responses you received contain important points: give yourself the option to leave. This is your life and you must make the right decision for yourself and for your children. Speak with your husband – if you cannot communicate your feelings of being trapped and unable to breathe (which are very powerful feelings indeed), then it is definitely time to start down a new path. Feeling depressed and lonely can be very crippling indeed, but feeling trapped physically and mentally makes it all so much worse. If you were to move on with your own life, what would that entail? What would need to be done? What arrangements would need to be made? If you were to stay, what would need to change? Decide what YOU want, and go for it.

Best of luck.