Still bubbling in reservoir, scared it could be head gasket?

I recently changed my thermostat due to overheating. Later learned I had to bleed after. Well, I tried and broke top off both when tightening. Still bubbling in reservoir. Scared it could be head gasket. Is there another way to bleed coolant system until I get paid my heat doesn't work so I bypassed heater core since it's bad. So, I can't turn heat on high my blower is burnt out I checked it under dash. Is there anything I can to even if temporary I need car at least 3 more months.