Sales job in england?

I am based in london and in my contract , it does not say anywhere if i required to travel out of london to meet customers. Since my CEO is after my job, He ordered to go and cover existing customer and dev more customer out of london for complete month. basically he is not letting me stay in london. I do have customers in london which he don't want me to visit. stay in hotel for five days continue is effecting my health , I requested to relocate me out of london which he refused. I want to know what are my rights as nothing is mention about out of london traveling in contract. they never give me in writing about my traveling. always forced me to make myself five days out of london travel plan. Please advice