My husband is complaining of these symptoms
Thanks for your question on Chat Doctor. I can understand your concern. In my opinion, your husband is having arrhythmia. Arrhythmia is irregular heart beats. So this can cause fluttering feeling in chest. He is also having heart and kidney disease. He is also diabetic, so all these also favor arrhythmia more. So better to consult cardiologist and get done 1. ECG 2. 2 d echo. 3. Holder monitoring (24 hour continuous monitoring of ECG). He may need anti arrhythmia Chat Doctor.  Hope I have solved your query. I will be happy to help you further. Wishing good health to your husband. Thanks.