My oldest BP, a male didn't eat since Nov also, He just started feeding 2 weeks ago. He has fed last 2 Saturdays, but I'm still not completely sure if he is back on feed. I would say wait a little more.
I dont really think there is much a vet can do to get your BP back to eating.
I was informed by members of this forum to try to get a vet or a breeder with knowledge to get an injection of Flagyl for him. But as soon as I started making plans for it, he started eating again. Maybe he knew what was coming... lol.