I have a 1997 Mazda 121 Metro 1

I have a 1997 mazda 121 metro 1.5 litre manual, thrust/release bearing was noisy and having difficulty engaging gears, have stripped car and gearbox has split from engine by about 20mm but appears to be stuck? I cant get it to come off engine, I have used the pry bar with a lot of force for a few hours and dont seem to be getting anywhere? Any ideas what is holding the gearbox on? And how I can get it off, I have never come accross this before?