So after a high speed 30 mile road ride, I'm getting pain in my right achilles tendon whenever I pedal (it starts after about 2-3 minutes of riding)

Is it still safe to ride my (4.5 mile each way) commute without damaging it further? Should I take precautions like abandoning clipless, lowering my seat, etc? I've already slowed my pace from ~18mph to ~13mph.