Phenytek availability

Suddenly Rite aid told me they couldn't get any more phenytek through their warehouse and my doc's pa has been calling around trying to find a pharmacy that could(got some generic "phenytek" but previously with generic phenytoin my level dipped and I had a seizure....(my neurologist back then  said it was garbage which he never used) I wondered if anyone else was having the same problem and if anyone had ony info......thanks, Mark