Hi.
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns..
As per your complain the symptoms of pain Achilles tendon in the morning with beginning of a routine of running and running on hills can be due to
Achilles Tendonitis that is inflammation of Achilles tendon that is due to sudden overuse of the legs and feet..
As of now you can limit up running up the hills and even on the flat surface..
You should do cool compresses over the area..
You can apply an
Analgesic gel like
Diclofenac and wrap either with a crape bandage or a ankle strap.
Take anti-inflammatory painkillers like Ibuprofen or Naproxen..
You can take
Muscle relaxant like Chlorzoxasone..
In case if still there is no improvement you can consult an Orthopedician and get evaluated and an x ray can help in diagnosis.
You can be advised either immobilization of the foot or movable shoe or boot can be applied..
You can be advised to take painkiller and muscle relaxant and other therapies advised abve and along with it you can also be advised night split and
Physiotherapy under trained Physiotherapist..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora.