Please. I Have Epiretineal Membrane ,celofan Form Stationary For 7

Please. i have epiretineal membrane ,celofan form stationary for 7 months. I used Yellox eye drops ,2 drops a day one month with 3 month pause. Today my oftalmologist prescribes Nevanac 3 drops a day
but i cannot find at the pharm and even i find it is 5 times more expensive than Yellox.I mention i am a poor man from Romania. Help me please with a medical advise! Thank you very much!