Hello and Welcome to ‘Ask A Doctor’ service. I have reviewed your query and here is my advice.
I passed carefully through your question and would explain that it is important performing a comprehensive differential diagnosis between different possible causes that may lead to your symptoms: 
heart failure or increased fluid retention (renal or 
liver dysfunction), or a possible infection or inflammation. 
For this reason, I recommend consulting with your attending physician for a physical exam and some tests: 
- a resting ECG and a cardiac ultrasound
- NT pro BNP plasma levels
- blood electrolytes
- a chest 
X ray study
- 
complete blood count, PCR, ESR for inflammation
- 
kidney and liver function tests. 
You should discuss with your doctor on the above tests. 
Hope I have answered your query. Let me know if I can assist you further.