I don't want to dissolve my filler, are there options to help with filler edema/water retention?

Most fillers that are made of hyaluronic acid do attract water. If a patient is prone to water retention, they may notice swelling in the areas that have been treated. In that case, doctors suggest avoiding a diet that is high in salt and processed foods. If necessary, doctors may prescribe a low dose diuretic. A gentle lymphatic massage may help with swelling. Hyaluronic acid attracts and binds to water easily, therefore the water must be prevented in the first place. Additionally, a low sodium diet and plenty of rest will definitely help a lot.

Yes lymphatic massage can help. I have a similar issue myself, actually and I take a natural diuretic. Fresh pineapple can be eaten to reduce water retention too. I also find using an electric cleansing brush twice a day helps a ton. Daily antihistimine is also beneficial. Filler can disolved with an enzyme if it is an HA.

As your fluid retention seems to be cyclical it is a good idea to maintain a healthy, low sodium diet and try to get plenty of rest. Bromelain is a supplement that is helpful for some to control swelling.