Wow - my heart really goes out to you. I know how you feel - I quit praying after I was DF'd - figured my prayers were never answered and fell on deaf ears anyways. But I realize now that my prayers WERE being answered, it just wasn't the answer I was expecting or looking for.
When my son was little and I was trying so very hard to be a good JW, aux pioneering, trying to find work to support myself and my son that wouldn't require working on meeting nights (and on and on) - I prayed for help - I was miserable and prayed that God would make me happy. One day I walked into the restroom of a large office building to freshen-up before an interview there. A woman was walking out the door - she turned around and came back in and said that the Lord had given her a message for me - that he heard me and had a plan for my life. Of course, I was a JW at the time and thought she must be crazy.
But she was right. All these years later I look back on the circumstances that have evolved to find me in the position I'm in now and I realize it was a purposly woven plan for my life. It hasn't always been fun - many things I've been through I have begged to be released from - I have been through abuse, depression, the loss of my father, my brother's murder, to name a few - but I now look back and realize that every one of those experiences helped me grow to the person I am today. I don't believe God caused these experiences - but I do believe he can use them to our advantage - as the scripture says "beauty from ashes". I really like who I am now - I am happy and content - and I now know that I have the strength to overcome many things. I'm not afraid any more. I know would not have made it to this point of healing and growth had I not been on this path.
With that being said - I do believe God hears our prayers, and I do believe he answers them. But it's not always the answer we wanted - or when we wanted it.