could it be my headgasket?

has anyone ever experienced excessive stalling and intermittent loss of power when driving? ive been having it a bit for the last week now, it seems to be low on power, drinking diesel like a tramp drinks white lightning its not using water though, well it needed a drop last week but nothing since i changed the water pump, rad thermostat and all the belts.
is it likley it is the head? or sh1tty injectors or a clogged fuel filter or a dodgy fuel pump? my run with this car hasnt been very fortunate, whoever buys it when i sell it will get a perfect car lol
any help will be very much appriciated
thankyou

The usual symptoms of head gasket can be, over heating/ when you look in the oil filler cap if there’s water in the system, the oil will appear throthy and sometimes creamy brown/ remove the water cap you could see oil deposits mixed in the water, the engine could also start miss firing,