Working out after open heart surgery

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Had triple bypass surgery in Oct the day i was supposed to have bariatric surgery. I weighed 341lbs standing 6'3". My BMI was around 41, i have a huge belly. Lost weight in first month could not eat much, then started gaining weight again at around 4 lbs a week. During cardiac rehab they got me back to working out and also got me back to tracking cals. I lost 2 lbs the first week and 8 the next when i started lifting and swimming. I will be blogging or writing on here with weekly updates, anyone that has had the same surgery and has any tips recipes or any advise let me know.