Training for a trek i developed a problem with my achilles tendon, what should i do now?

R.I.C.E.: Always seek medical evaluation if your condition does not improve with treatment. Briefly, care should begin with ice, rest, and a compressive wrap. Early range of motion is important when pain allows. Medications and physical therapy can be helpful as well. If pain persists, see an orthopedic specialist for further guidance.

I agree: Also try to change up your training to avoid overuse injury. Best of luck!

Rest it: You can rest it, put a small heel lift in your shoe, go to pt for graston technique to the tendon, or consider prolotherapy injections under ultrasound guidance into the damaged part of the tendon.