I can appreciate your concern.
Your increase in weight, along with increase in dyspnea and swelling of legs, all indicate that you are having fluid retention.
THe increasing dyspnea specially is worrisome - it could indicate that your heart is having decreased function. It may also be due to pleural effusion, fluid in the pleural sac around your lungs
This is not something to treat at home. Diuretics alone will not be sufficient to treat this. The soya sauce is only coincidental. You are likely to be having impaired cardiac function.
You need to see your doctor for this ASAP. If necessary, if you cannot get an early appointment, you should go to the ER. You will need tests for heart function. You will also need other medicines besides diuretics.
Go to your doctor at the earliest for this, and preferably go to the ER. You need urgent medical attention for this.
Take care - I want you to be safe - home treatment is not good enough for this.
Hope that satisfies your query. If so, please choose a positive rating.
If you have any other queries, do ask. Wish you good health and a quick recovery. Bonus is always welcome!
Dr. P. Jyoti