I do go to the gym a few times a week could this has caused it to disappear so quickly
There can be swelling for several weeks after injections. Tear troughs are one of the most difficult place to inject; you often need multiple visits to achieve desired results. Swelling may have gone down, but there are still deficits that need to be addressed. It shouldn't have all metabolized in 2 months, it might be worth looking at before pictures and see if you can see any results still. You may just need more filler to the area.