With understanding of the simplicity of this problem, it’s reasonable to be able to improve symptoms with simple management.
Sleeping with an eye mask may help with the drop in pressure over night, compression of the area will also be helpful on waking. This should be done for 5 minutes in the morning and also when the problem occurs. Exercise the muscle that are working firmly for 5-minute bursts a few times a day.
It is also possible to us diuretic drugs to reduce the oedema, however this is very extreme and shouldn’t be necessary especially if inexperienced with their use and without the patients consent to test renal/kidney function.