orthotics should not hurt...especiallly if you have worn them before.
i would give it another week. if you continue to have pain, speak to the clinician again.
if she refuses to help you, get a second opinion from a podiatrist who is experienced in biomechanics and orthotic casting.
typically for tibiallis pain, a patient should be casted with plaster for orthotics. there should be a deep heel cup with a medial and lateral flange. a lateral post would make you put more strain on the inner ankle and tibialis tendon. i am not sure if this is a good modification for you. if you were plaster casted with the foot at neutral, it would capture your natural arch b/f you put weight on the foot. so, it really wouldn't be too high for you.