I understand what she's going through. I had my heart attack back February 3 2019, it was a widow maker. That's when all 4 valves are blocked 100%. they saved my life by puting a single stint in my heart and believe it or not, I walked out of the hospital 3days later. Well 2 years went by and started to feel drained, no energy then eventually I developed a serious cough that wouldn't go away. I would cough until I couldn't catch my breath and pass out and the simplest tasks would leave me out of breath. One night I went into a coughing fit that wouldn't stop and I started having serious chest pains, " it was my heart " my wife called 911 and I was rushed to the hospital. I can remember being wheeled in and seeing all the Drs and nurses all around me and I remember the huge needle being stuck into my stomach but nothing for three weeks after that because I was in induced coma and on complete life support. The lower lobe of my heart took quite the beating leaving it with only a 15% ejection fraction but in my case it will ever heal I've got congestive heart failure and because of all the water pills I've been taking and the pancreatitis I had I'm also in stage 3 of kidney failure and my Drs diagnosed me as being terminal so my case manager referred me to hospice care. I'm not meaning to scare nor worry you but all the symptoms you explained in your post about waking up every morning feeling extremely sick, dizzy, faint, and I have the worst pain in my shoulder joints and my neck that comes along with it. It eases up a little in the evening but the same when I wake up.make sure that she continues to take her meds and no salt or cigarettes. Try to limit her fluid intake to a quart a day. That's the combined amount of all liquids, no sodas, coffee and cut back on sugarband red meat. If she has a hard time getting any exercise because of running out of breath, have her exercise in bed by doing leg lifts and bending her knees and ankles and wiggle her toes to keep the circulation going. If she doesn't she'll end up with a pulmonary embolism like I did, I was on blood thinners for a couple of months that caused internal bleeding so I stopped taking them. I wish there were something I could do to make everything better for your mom but all I can do is pray and I will do that for you. Feel free to reach out to me if you need someone to chat with. It really helps to know that your not alone.