I hope it works out for you. Sometimes if you focus on the friendship part of the marraige, the other stuff will follow. My husband and I have had our share of problems, let me tell you..and it is constant work, but things are finally starting to be good. I do agree your children should see you happy, so work on yourself as well, seperate from the marraige...get some hobbies, read some good books,, etc...
Good Luck!!!