An excellent article about excessive worry and how it effects relationships .. take a read!
I'm a talker; if something is bothering me in a relationship, rather than stew about it and let it fester into something more, I have to talk to that person about it. Sometimes, just knowing that your spouse is receptive to discussions or just plain listening when something is upsetting you can be a huge help.
According to my husband I'm an obsesser.
Your DH and mine sound a lot alike! LOL But I know what you mean about putting things into perspective; he's helped me a lot with that. I remember once, he asked me if worrying about a particular problem would help me find a solution or if it was one of those things that I really had no control over. Now, when I'm faced with a situation that's causing me stress, I step back and ask myself... is it something I can actually do something about or is it out of my hands and I'm just worrying over the outcome? If there's nothing I can actually do to change the outcome, I let it go. Beats the heck out of coming up with a bazillion different sceneries of "what if...?" Now I just wait and deal with the "what if's" if they occur! LOL