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Check out the Mayo Clinic Diet (the real one from the actual Mayo Clinic, not the fad diets with the same name). It's focus is supposed to be healthy eating habits to promote weight loss. I haven't read the book yet, but I plan to check my library because it looks pretty interesting.

http://www.mayoclinic.com/health/mayo-clinic-diet/my01646

Weight watchers is a great option if you can afford it! It's great to have a meeting leader (I prefer doing WW in person with meetings than online, especially if you're starting new) because they can talk to you about your concerns, look at what you're eating, and make suggestions. WW "requires" you to earn activity points and having them be able to review what you can/can't do due to your heart condition can help personalize it for you.

If you can't afford or aren't able to do the weekly meetings, I'd say skip WW online and do My Fitness Pal. It's very similar to WW (WW uses points they calculate for each food, whereas MFP uses calories but also tracks Fat, Carbs, etc) MFP is free, and it's online and a phone app. You track what you eat and it calculates your calories. You set a calorie goal (that can be changed anytime) and try to meet that. It's also an online community of sorts which is GREAT for motivation and support. That's what I'm going back to post baby! I used both combined (my work provided a WW meeting 1/2 price each week but when I moved I switched to MFP) to lose just over 48 pounds. Yep, I ALMOST made it to 50 before getting knocked up, haha.

I have lots of stuff about both on my blog (link in my profile) under the label "losing it." Happy to talk to you about either anytime!

And for me, eating healthier meant finding veggies I liked (zucchini and brussels sprouts, and even spaghetti squash) and making them the MAIN focus of my meals instead of carbs. I was a carb addict (still am!) and always was basing meals on at least 50% carbs. So spaghetti squash with meatballs, or zucchini enchiladas, replaced bad meals. And filling meals like sauteed brussies became weekly staples. I think you have to find replacements for "bad" meals you love and then really stick with a schedule to make them! When you're tracking points or calories, it is much easier to have "set" meals to make because you easily know "that's 8 points / 400 calories" and have to think less