Trying to ramp up training but getting blocked

Starting my swim sessions in the morning and doing ok. Running hasn't happened since the weekend and nly one short bike ride , some spinning but it just leaves me low and subject to flack for too much training. But I have only 3weeks to go..... Less actually as work is ramping up big time so wont get much training in next week ? LLL complaining about training time so how does one carry off the balancing act on the run up to the event ? Any suggestions welcome.