What Causes The Inability To Absorb Calcium And Developing A Low Sodium Count?

Hello, I am a 51 year old female who is having problems with an inability to absorb calcium and I have a Hct of 30. My past hx is hypertension at 14, diabetes at 27. 2 pregnancy full term and 1 miscarriage, and DJD, 2 herneated dics. @ age 50 1st MCI and developed a low sodium count of 112 causing seizures. and in 2 weeks had another heart attack and ended up with a stint in the main branch this all happen in a six period in 2012. And in June 2013 I had a massive stroke and a grand mall seizure. In a coma I was suppose to recover from. being that I was 60 percent brain dead. But I recovered, I had a hx post pardium cardiomyopathy after last pregnancy. And a hysterectomy in 2001, and a gastric bypass in 2003. @ the time of surgery I weighed 337. I weigh 200. And have been down to 185 but no longer take dieuretics as I did before. Because of the low sodium and such. I need to have some fat removed especially the apron. I am 5 foot 6inches. I have had these problems and been near death to many times.