Medullary Thyroid Cancer total Neck Dissection Lymphectomy

Was wondering if anyone else who has had a neck dissection with lymphectomy is experiencing issues with extreme heat or cold? Seems that when I am outside working that I experience lymphedema. Is this normal? I am post op as of July 11, 2016. Being a Farmer my lively hood requires me to be outside. Not sure if I am going to be able to handle it.