There may be a very good reason that you have been told to take 2000mg a day.
In the UK, a huge study was done on
fish oil supplements, over 7 years. It was discovered that many pills are actually a waste of time. Look on the bottle of your pills to see how much EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid) they contain in each capsule. These oils are good for the heart and brain, and you need 500mg daily for a healthy heart and 1000mg for the brain.